Antipicornaviral compounds and methods for their use and preparation

ABSTRACT

Picornaviral 3C protease inhibitors, obtainable by chemical synthesis, inhibit or block the biological activity of picornaviral 3C proteases. These compounds, as well as pharmaceutical compositions that contain these compounds, are suitable for treating patients or hosts infected with one or more picornaviruses. Several novel methods and intermediates can be used to prepare the novel picornaviral 3C protease inhibitors of the present invention.

The invention pertains to the discovery and use of new compounds that inhibit the enzymatic activity of picornaviral 3C proteases, specifically rhinovirus proteases (RVPs), as well as retard viral growth in cell culture.

The picornaviruses are a family of tiny non-enveloped positive stranded RNA containing viruses that infect humans and other animals. These viruses include the human rhinoviruses, human polioviruses, human coxsackieviruses, human echoviruses, human and bovine enteroviruses, encephalomyocarditis viruses, menigovirus, foot and mouth viruses, hepatitis A virus and others. The human rhinoviruses are a major cause of the common cold. To date, there are no effective therapies to cure the common cold, only treatments that relieve the symptoms.

One strategy that may be useful to treat picornaviral infections is by inhibiting the proteolytic 3C enzymes. These enzymes are required for the natural maturation of the picornaviruses. They are responsible for the autocatalytic cleavage of the genomic, large polyprotein into the essential viral proteins. Members of the 3C protease family are cysteine proteases, where the sulfhydryl group most often cleaves the glutamine-glycine amide bond. In theory, inhibition of 3C proteases can block proteolytic cleavage of the polyprotein, which in turn can retard the maturation and replication of the viruses by interfering with viral particle production. Therefore, inhibiting the processing of this cysteine protease with selective, small molecules that are specifically recognized, may represent an important and useful approach to treat and cure viral infections of this nature and, in particular, the common cold.

SUMMARY OF THE INVENTION

The present invention is directed to compounds that functions as picornaviral 3C protease inhibitors, particularly those that have antiviral activity. It is further directed to the preparation and use of such 3C protease inhibitors. The Inventors demonstrate that the compounds of the present invention bind to rhinovirus 3C proteases and preferably have antiviral cell culture activity. The enzymatic inhibition assays used reveal that these compounds can bind irreversibly, and the cell culture assays demonstrate that these compounds can possess antiviral activity.

The present invention is directed to compounds of the formula (a): ##STR1## wherein R₁ is H, F, an alkyl group, OH, SH, an O-alkyl group, or an S-alkyl group;

R₂ and R₅ are independently selected from H, ##STR2## or an alkyl group, wherein said alkyl group is different from ##STR3## with the proviso that at least one of R₂ or R₅ must be ##STR4## and wherein, when R₂ or R₅ is ##STR5## X is ═CH or ═CF and Y₁ is ═CH or ═CF or X and Y₁ together with Q' form a three-membered ring

in which Q' is --C(R₁₀)(R₁₁)-- or --O--, X is --CH-- or --CF--, and Y₁ is --CH--, --CF--, or --C(alkyl)--, where R₁₀ and R₁₁ independently are H, a halogen, or an alkyl group, or, together with the carbon atom to which they are attached, form a cycloalkyl group or a heterocycloalkyl group,

or X is --CH₂ --, --CF₂ --, --CHF--, or --S--,

and Y₁ is --O--, --S--, --NR₁₂ --, --C(R₁₃)(R₁₄)--, --C(O)--, --C(S)--, or --C(CR₁₃ R₁₄)--

wherein R₁₂ is H or alkyl, and R₁₃ and R₁₄ independently are H, F, or an alkyl group, or, together with the atoms to which they are bonded, form a cycloalkyl group or a heterocycloalkyl group;

and A₁ is C, CH, CF, S, P, Se, N, NR₁₅, S(O), Se(O), P-OR₁ 5, or P--NR₁₅ R₁₆

wherein R₁ and R₁₆ independently are an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group, or, together with the atom to which they are bonded, form a heterocycloalkyl group;

and D₁ is a moiety with a lone pair of electrons capable of forming a hydrogen bond;

and B is H, F, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, --OR₁₇, --SR₁₇, --NR₁₇ R₁₈, --NR₁₉ NR₁₇ R₁₈, or --NR₁₇ OR₁₈

wherein R₁₇, R₁₈, and R₁₉ independently are H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, or an acyl group, or, wherein any two of R₁₇, R₁₈, and R₁₉, together with the atom(s) to which they are bonded, form a heterocycloalkyl group;

and with the provisos that when D₁ is the moiety .tbd.N with a lone pair of electrons capable of forming a hydrogen bond, B₁ does not exist; and when A₁ is an sp³ carbon, B₁ is not --NR₁₇ R₁₈ when D₁ is the moiety --NR₂₅ R₂₆ with a lone pair of electrons capable of forming a hydrogen bond, wherein R₂₅ and R₂₆ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group;

and wherein D₁ --A₁ --B₁ optionally forms a nitro group where Al is N;

and wherein, when R₂ or R₅ is ##STR6## X is ═CH or ═CF and Y₂ is ═C, ═CH or ═CF, or X and Y₂ together with Q' form a three-membered ring

in which Q' is --C(R₁₀)(R₁₁)-- or --O--, X is --CH-- or --CF--, and Y₂ is --CH--, --CF--, or --C(alkyl)--, where R₁₀ and R₁₁ independently are H, a halogen, or an alkyl group, or, together with the carbon atom to which they are attached, form a cycloalkyl group or a heterocycloalkyl group,

or X is --CH₂ --, --CF₂ --, --CHF--, or --S--,

and Y₂ is --O--, --S--, --N(R'₁₂)--, --C(R'₁₃)(R'₁₄)--, --C(O)--, --C(S)--, or --C(CR'₁₃ R'₁₄)--

wherein R'₁₂ is H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, --OR'₁₃, --NR'₁₃ R'₁₄, --C(O)--R'₁₃, --SO₂ R'₁₃, or --C(S)R'₁₃, and R'₁₃ and R'₁₄, independently are H, F, or an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group or, together with the atom to which they are attached, form a cycloalkyl group or a heterocycloalkyl group;

and wherein any combination of Y2, A₂, B₂, and D₂ forms a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group;

and A₂ is C, CH, CF, S, P, Se, N, NR₁₅, S(O), Se(O), P--OR₁₅, or P--NR₁₅ R₁₆

wherein R₁₅ and R₁₆ independently are an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group or, together with the atom to which they are bonded, form a heterocycloalkyl group;

and D₂ is a moiety with a lone pair of electrons capable of forming a hydrogen bond;

and B₂ is H, F, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, --OR₁₇, --SR₁₇, --NR₁₇ R₁₈, --NR₁₉ NR₁₇ R₁₈, or --NR₁₇ OR₁₈

wherein R₁₇, R₁₈, and R₁₉ independently are H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, or an acyl group, or, wherein any two of R₁₇, R₁₈, and R₁₉, together with the atom(s) to which they are bonded, form a heterocycloalkyl group;

R₃ and R₆ are independently H, F, or an alkyl group;

R₄ is H, OH, or a suitable organic moiety;

Z and Z₁ are independently H, F, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, --C(O)R₂₁, --CO₂ R₂₁, --CN, --C(O)NR₂, R₂₂, --C(O)NR₂₁ OR₂₂, --C(S)R₂₁, --C(S)NR₂₁ R₂₂, --NO₂, --SOR₂₁, --SO₂ R₂₁, --SO₂ NR₂₁ R₂₂, --SO(NR₂₁)(OR₂₂), --SONR₂₁, --SO₃ R₂₁, --PO(OR₂₁)₂, --PO(R₂₁)(R₂₂), --PO(NR₂₁ R₂₂)(OR₂₃), --PO(NR₂₁ R₂₂)(NR₂₃ R₂₄), --C(O)NR₂₁ NR₂₂ R₂₃, or --C(S)NR₂₁ NR₂₂ R₂₃,

wherein R₂₁, R₂₂, R₂₃, and R₂₄ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, an acyl group, or a thioacyl group, or wherein any two of R₂₁, R₂₂, R₂₃, and R₂₄, together with the atom(s) to which they are bonded, form a heterocycloalkyl group;

or Z₁, as defined above, together with R₁, as defined above, and the atoms to which Z₁ and R₁ are bonded, form a cycloalkyl or heterocycloalkyl group,

or Z and Z₁, both as defined above, together with the atoms to which they are bonded, form a cycloalkyl or heterocycloalkyl group;

and pharmaceutically acceptable prodrugs, salts, and solvates thereof;

and wherein these compounds, pharmaceutically acceptable prodrugs, salts, and solvates preferably have antipicornaviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay, and more preferably antirhinoviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay and/or anticoxsachieviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay.

The present invention is also directed to several methods of preparing compounds of formula (I), defined above. One method according to the invention involves converting a compound of formula Q ##STR7## wherein R₁, R₂ and R₅ are as defined above, and P₁ is a protective group, preferably benzyloxy carbonyl or t-butoxycarbonyl, or a salt or solvate thereof, to a compound of formula I, as defined above, or a pharmaceutically acceptable prodrug, salt or solvate thereof.

Another method according to the invention involves converting a compound of the formula B: ##STR8## wherein R₁, R₂ and R₅ are as defined above, or a salt or solvate thereof, to a compound of formula I, as defined above, or a pharmaceutically acceptable prodrug, salt or solvate thereof.

Another method according to the invention involves converting a compound of formula O: ##STR9## wherein R₁, R₂, R₅, Z and Z₁ are as defined above and P₁ is a protective group, preferably benzyloxy carbonyl or t-butoxycarbonyl, or a salt or solvate thereof, to a compound of formula I, as defined above, or a pharmaceutically acceptable prodrug, salt or solvate thereof.

Another method according to the present invention involves converting a compound of formula P: ##STR10## wherein R₁, R₂, R₅, Z and Z₁ are as defined above, or a salt or solvate thereof, to a compound of formula I, as defined above, or a pharmaceutically acceptable prodrug, salt or solvate thereof.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to compounds of the formula I ##STR11## wherein R₁, R₂, R₃, R₄, R₅, R₆, Z and Z₁ are as defined above, and to the pharmaceutically acceptable prodrugs, salts, and solvates thereof, where these compounds, pharmaceutically acceptable prodrugs, salts, and solvates preferably have antipicornaviral activity with an EC₅₀ less than or equal to 100 FM in the HI-HeLa cell culture assay, and more preferably antirhinoviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay and/or anticoxsachieviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay.

The present invention preferably relates to compounds of the formula II: ##STR12## wherein R₃₁ is H, F or an alkyl group;

R₃₂ is selected from one of the following moieties: ##STR13## wherein R₃₅ is H, an alkyl group, an aryl group, --OR₃₈, or --NR₃₈ R₃₉, and

R₃₆ is H or an alkyl group,

or R₃₅ and R₃₆, together with the atom(s) to which they are attached, form a heterocycloalkyl group or a heteroaryl group;

R₄₁ is H, an alkyl group, an aryl group, --OR₃₈, --SR₃₉, --NR₃₈ R₃₉, --NR₄₀ NR₃₈ R₃₉, or

--NR₃₈ OR₃₉, or R₄₁ and R₃₆, together with the atom(s) to which they are attached, form a heterocycloalkyl group;

R₃₇ is an alkyl group, an aryl group, or --NR₃₈ R₃₉ ;

wherein R₃₈, R₃₉, and R₄₀ independently are H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, or an acyl group, or, wherein any two of R₃₈, R₃₉, and R₄₀, together with the atom(s) to which they are bonded, form a heterocycloalkyl group;

n is 0, 1 or 2;

R₃₃ is H or an alkyl group;

R₃₄ is an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, an O-alkyl an O-cycloalkyl group, an O-heterocycloalkyl group, an O-aryl group, an O-heteroaryl group, an S-alkyl group, an NH-alkyl group, an NH-aryl group, an N,N-dialkyl group, or an N,N-diaryl group; and

Z and Z₁ are independently H, F, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, --C(O)R₂₁, --CO₂ R₂₁, --CN, --C(O)NR₂₁ R₂₂, --C(O)NR₂₁ OR₂₂, --C(S)R₂₁, --C(S)NR₂₁ R₂₂, --NO₂, --SOR₂₁, --SO₂ R₂₁, --SO₂ NR₂₁ R₂₂, --SO(NR₂₁)(OR₂₂), --SONR₂₁, --SO₃ R₂₁, --PO(OR₂₁)₂₁, --PO(R₂₁)(R₂₂), --PO(NR₂₁ R₂₂)(OR₂₃), --PO(R₂₁ R₂₂)(NR₂₃ R₂₄), --C(O)NR₂₁ NR₂₂ R₂₃, or --C(S)NR₂₁ NR₂₂ R₂₃,

wherein R₂₁, R₂₂, R₂₃, and R₂₄ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, an acyl group, or a thioacyl group, or wherein any two of R₂₁, R₂₂, R₂₃, and R₂₄, together with the atom(s) to which they are bonded, form a heterocycloalkyl group,

or Z and Z₁, both as defined above, together with the atoms to which they are bonded, form a heterocyclo alkyl group;

and pharmaceutically acceptable prodrugs, salts, and solvates thereof.

As used in the present application, the following definitions apply:

An "alkyl group" is intended to mean a straight or branched chain monovalent radical of saturated and/or unsaturated carbon atoms and hydrogen atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, ethenyl, pentenyl, butenyl, propenyl, ethynyl, butynyl, propynyl, pentynl, hexynyl, and the like, which may be unsubstituted (i.e., containing only carbon and hydrogen) or substituted by one or more suitable substituents as defined below.

A "cycloalkyl group" is intended to mean a non-aromatic, monovalent monocyclic, bicyclic, or tricyclic radical containing 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14 carbon ring atoms, each of which may be saturated or unsaturated, and which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more heterocycloalkyl groups, aryl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of cycloalkyl groups include, but are not limited to, the following moieties: ##STR14##

A "heterocycloalkyl group" is intended to mean a non-aromatic, monovalent monocyclic, bicyclic, or tricyclic radical, which is saturated or unsaturated, containing 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 ring atoms, and which includes 1, 2, 3, 4, or 5 heteroatoms selected from nitrogen, oxygen and sulfur, wherein the radical is unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, aryl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of heterocycloalkyl groups include, but are not limited to the following moieties: ##STR15##

An "aryl group" is intended to mean an aromatic, monovalent monocyclic, bicyclic, or tricyclic radical containing 6, 10, 14, 18 carbon ring atoms, which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, heterocycloalkyl groups, or heteroaryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of aryl groups include, but are not limited to, the following moieties: ##STR16##

A "heteroaryl group" is intended to mean an aromatic monovalent monocyclic, bicyclic, or tricyclic radical containing 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18 ring atoms, including 1, 2, 3, 4, or 5 heteroatoms selected from nitrogen, oxygen and sulfur, which may be unsubstituted or substituted by one or more suitable substituents as defined below, and to which may be fused one or more cycloalkyl groups, heterocycloalkyl groups, or aryl groups, which themselves may be unsubstituted or substituted by one or more suitable substituents. Illustrative examples of heteroaryl groups include, but are not limited to, the following moieties: ##STR17##

An "acyl group" is intended to mean a --C(O)--R radical, wherein R is any suitable substituent as defined below.

A "thioacyl group" is intended to mean a --C(S)--R radical, wherein R is any suitable substituent as defined below.

A "sulfonyl group" is intended to mean a --SO₂ R radical, wherein R is any suitable substituent as defined below.

The term "suitable substituent" is intended to mean any of the substituents recognizable, such as by routine testing, to those skilled in the art as not adversely affecting the inhibitory activity of the inventive compounds. Illustrative examples of suitable substituents include, but are not limited to, hydroxy groups, oxo groups, alkyl groups, acyl groups, sulfonyl groups, mercapto groups, alkylthio groups, alkoxy groups, cycloalkyl groups, heterocycloalkyl groups, aryl groups, heteroaryl groups, carboxy groups, amino groups, alkylamino groups, dialkylamino groups, carbamoyl groups, aryloxy groups, heteroarlyoxy groups, arylthio groups, heteroarylthio groups, and the like.

The term "suitable organic moiety" is intended to mean any organic moiety recognizable, such as by routine testing, to those skilled in the art as not adversely affecting the inhibitory activity of the inventive compounds. Illustrative examples of suitable organic moieties include, but are not limited to, hydroxy groups, alkyl groups, oxo groups, cycloalkyl groups, heterocycloalkyl groups, aryl groups, heteroaryl groups, acyl groups, sulfonyl groups, mercapto groups, alkylthio groups, alkoxy groups, carboxy groups, amino groups, alkylamino groups, dialkylamino groups, carbamoyl groups, arylthio groups, heteroarylthio groups, and the like.

A "hydroxy group" is intended to mean the radical --OH.

An "amino group" is intended to mean the radical --NH₂.

An "alkylamino group" is intended to mean the radical --NHR where R is an alkyl group as defined above.

A "dialkylamino group" is intended to mean the radical --NR_(a) R_(b) where R_(a) and R_(b) are each independently an alkyl group as defined above.

An "alkoxy group" is intended to mean the radical --OR where R is an alkyl group as defined above, for example, methoxy, ethoxy, propoxy and the like.

An "alkoxycarbonyl group" is intended to mean the radical --C(O)OR where R is an alkyl group as defined above.

An "alkylsulfonyl group" is intended to mean the radical --SO₂ R where R is an alkyl group as defined above.

An "alkylaminocarbonyl group" is intended to mean the radical --C(O)NHR where R is an alkyl group as defined above.

A "dialkylaminocarbonyl group" is intended to mean the radical --C(O)NR_(a) R_(b) where R_(a) and R_(b) are each independently an alkyl group as defined above.

A "mercapto group" is intended to mean the radical --SH.

An "alkylthio group" is intended to mean the radical --SR where R is an alkyl group as defined above.

A "carboxy group" is intended to mean the radical --C(O)OH.

A "carbamoyl group" is intended to mean the radical --C(O)NH₂.

An "aryloxy group" is intended to mean the radical --OR where R_(c) is an aryl group as defined above.

A "heteroarlyoxy group" is intended to mean the radical --OR_(d) where R_(d) is a heteroaryl group as defined above.

An "arylthio group" is intended to mean the radical --SR_(d) where R_(c) is an aryl group as defined above.

A "heteroarylthio group" is intended to mean the radical --SR_(d) where R_(d) is a heteroaryl group as defined above.

A "pharmaceutically acceptable prodrug" is intended to mean a compound that may be converted under physiological conditions or by solvolysis to a compound of formula I or formula II.

A "pharmaceutically acceptable solvate" is intended to mean a solvate that retains the biological effectiveness and properties of the biologically active components of compounds of formulas I and II.

Examples of pharmaceutically acceptable solvates include, but are not limited to, water, isopropanol, ethanol, methanol, DMSO, ethyl acetate, acetic acid, and ethanolamine.

A "pharmaceutically acceptable salt" is intended to a mean a salt that retains the biological effectiveness and properties of the free acids and bases of compounds of formulas I and II and that is not biologically or otherwise undesirable.

Examples of pharmaceutically acceptable salts include, but are not limited to, sulfates, pyrosulfates, bisulfates, sulfites, bisulfites, phosphates, monohydrogenphosphates, dihydrogenphosphates, metaphosphates, pyrophosphates, chlorides, bromides, iodides, acetates, propionates, decanoates, caprylates, acrylates, formates, isobutyrates, caproates, heptanoates, propiolates, oxalates, malonates, succinates, suberates, sebacates, fumarates, maleates, butyne-1,4-dioates, hexyne-1,6-dioates, benzoates, chlorobenzoates, methylbenzoates, dinitrobenzoates, hydroxybenzoates, methoxybenzoates, phthalates, sulfonates, xylenesulfonates, phenylacetates, phenylpropionates, phenylbutyrates, citrates, lactates, γ-hydroxybutyrates, glycolates, tartrates, methane-sulfonates, propanesulfonates, naphthalene-1-sulfonates, naphthalene-2-sulfonates, and mandelates.

If the inventive compound is a base, the desired salt may be prepared by any suitable method known to the art, including treatment of the free base with an inorganic acid, such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, or with an organic acid, such as acetic acid, maleic acid, succinic acid, mandelic acid, fumaric acid, malonic acid, pyruvic acid, oxalic acid, glycolic acid, salicylic acid, pyranosidyl acids such as glucuronic acid and galacturonic acid, alpha-hydroxy acids such as citric acid and tartaric acid, amino acids such as aspartic acid and glutamic acid, aromatic acids such as benzoic acid and cinnamic acid, sulfonic acids such a p-toluenesulfonic acid or ethanesulfonic acid, or the like.

If the inventive compound is an acid, the desired salt may be prepared by any suitable method known to the art, including treatment of the free acid with an inorganic or organic base, such as an amine (primary, secondary or tertiary), an alkali metal or alkaline earth metal hydroxide or the like. Illustrative examples of suitable salts include organic salts derived from amino acids such as glycine and arginine, ammonia, primary, secondary and tertiary amines, and cyclic amines such as piperidine, morpholine and piperazine, and inorganic salts derived from sodium, calcium, potassium, magnesium, manganese, iron, copper, zinc, aluminum and lithium.

In the case of compounds, salts, or solvates that are solids, it is understood by those skilled in the art that the inventive compounds, salts, and solvates may exist in different crystal forms, all of which are intended to be within the scope of the present invention.

The inventive compounds may exist as single stereoisomers, racemates and/or mixtures of enantiomers and/or diastereomers. All such single stereoisomers, racemates and mixtures thereof are intended to be within the scope of the present invention. Preferably, the inventive compounds are used in optically pure form.

As generally understood by those skilled in the art, an optically pure compound is one that is enantiomerically pure. As used herein, the term "optically pure" is intended to mean a compound which comprises at least a sufficient amount of a single enantiomer to yield a compound having the desired pharmacological activity. Preferably, "optically pure" is intended to mean a compound that comprises at least 90% of a single isomer (80% enantiomeric excess), preferably at least 95% (90% e.e.), more preferably at least 97.5% (95% e.e.), and most preferably at least 99% (98% e.e.).

Preferably in the above formulas I and II, R₁ and R₃₁ are H or F. Preferably in formula I, R₄ is an acyl group or a sulfonyl group. Preferably in formulas I and II, D₁ and D₂ are --OR₂₅, ═O, ═S, .tbd.N, ═NR₂₅, or --NR₂₅ R₂₆, wherein R₂₅ and R₂₆ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, or a heteroaryl group, or, together with the nitrogen atom to which they are bonded, form a heterocycloalkyl group, and more preferably D₁ and D₂ are ═O. Preferably A₁ and A₂ are C, CH, S, or S(O), and more preferably A₁ and A₂ are C.

Preferably B₁ and B₂ are NR₁₇ R₁₈, wherein R₁₇ and R₁₈ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, an acyl group, or wherein R₁₇ and R₁₈, together with the atom(s) to which they are bonded, form a heterocycloalkyl group.

Preferably Z and Z₁ are independently H, an aryl group, or a heteroaryl group, --C(O)R₂₁, --CO₂ R₂₁, --CN, --C(O)NR₂₁ R₂₂, --C(O)NR₂₁ OR₂₂, --C(S)R₂₁, --C(S)NR₂₁ R₂₂, --NO₂, --SOR₂₁, --SO₂ R₂₁, --SO₂ NR₂₁ R₂₂, --S)(NR₂₁)(OR₂₂), --SONR₂₁, --SO₃ R₂₁, --C(O)NR₂₁ NR₂₂ R₂₃, or --C(S)NR₂₁ NR₂₂ R₂₃ ; wherein R₂₁, R₂₂, and R₂₃ are independently H, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an aryl group, a heteroaryl group, or an acyl group, or wherein any two of R₂₁, R₂₂, and R₂₃, together with the atom(s) to which they are bonded, form a heterocycloalkyl group, or Z and Z₁, together with the atoms to which they are attached, form a heterocycloalkyl group.

Preferably R₃₂ is one of the following moieties: ##STR18## wherein R₃₅, R₃₆, R₃₇, R₄₁ and n are as defined above.

Compounds according to formula I include the following, where * indicates point of attachment: Compounds 2, 3, 4, 5, 7, 11, 12, 13, 14, 16, 17, 18, 19, 21, 22, 24, 25, 41-43, 74, and 75 having the formula III: ##STR19## 2. R₂ is CH₂ CH₂ C(O)NHCPh₃, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

3. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

4. R₂ is CH₂ NHC(O)CH₃ ; R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

5. R₂ is ##STR20## R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ 7. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is CO₂ CH₃, and Z₁ is H

11. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₃

12. R₂ is CH₂ CH₂ S(O)CH₃, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

13. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is C(O)CH₃

14. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CN

16. R₂ is CH₂ NHC(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

17. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH(CH₃)₂

18. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR21## 19. R₂ is CH₂ CH₂ C(C)NH₂, R₁ is H, Z is H, and Z₁ is ##STR22## 21. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR23## 22. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is C(O)N(CH₃)₂

24. R₂ is CH₂ CH₂ C(O)NH₂ ; R₁ is H, Z is H, and Z₁ is C(O)Ph

25. R₂ is CH₂ CH₂ C(O)NH₂ ; R₁ is H, Z is H, and Z₁ is ##STR24## 41. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z is H; and ##STR25## 42. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR26## 43. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z is H; and ##STR27## 74. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z is H; and Z₁ is CH₂ Cl

75. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z is H; and Z₁ is ##STR28##

Compounds (26, 27, and 28) having the formula IV: ##STR29## where X₁ and X₂ independently are H, F, or Cl, 26. R₂ is CH₂ CH₂ C(O)NH₂, X₁ is Cl and X₂ is H

27. ₂ is CH₂ CH₂ C(O)NH₂, X₁ is F and X₂ is H

28. R₂ is CH₂ CH₂ C(O)NH₂, X₁ is H and X₂ is F

Compounds (30-34) having the formula V: ##STR30## 30. R₄ is PhCH₂ OC(O), X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

31. R₄ is CH₃ CH₂ CH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

32. R₄ is PhCH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

33. R₄ is CH₃ CH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

34. R₄ is PhSO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃

Compound 29 having the formula VI: ##STR31##

Compound 44 having the formula VII: ##STR32##

Compounds (35-37) having the formula VIII: ##STR33## 35. X₁ is F, R₂ is CH₂ CH₂ C(O)NH₂, Y is CH, Z is H, and Z₁ is CO₂ CH₂ CH₃

36. X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Y is N, Z is H, and Z₁ is CO₂ CH₂ CH₃

37. X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Y is CH, Z is H, and Z₁ is C(O)N(CH₃)OCH₃

Compounds 46-66 and 78 having the formula IX: ##STR34## 46. R₁ is H; R₂ is CH₂ CH₂ C()N₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and ##STR35## 47. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆ and X₁ are H; Y is CH; Z is H; and ##STR36## 48. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆ and X₁ are H; Y is CH; Z is H; and ##STR37## 49. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and ##STR38## 50. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and ##STR39## 51. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and ##STR40## 52. R₁ is H; R₂ is CH₂ CH₂ C(O)NH,; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is C(O)tBu

53. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, and R₆ are H; X₁ is OH; Y is CH; Z is H; and Z₁ is CO₂ CH₂ CH₃

54. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is C(O)C(O)CH₃

55. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is C(O)C(O)N(CH₃)₂

56. R₁ is H; R₂ is CH₂ OC(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is CO₂ CH₂ CH₃

57. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z and Z₁ together form ##STR41## where the S is preferably trans to the R₁ group 58. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; and Z and Z₁ together form ##STR42## 59. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is C(O)NHPh

60. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is C(O)N(CH₂)Ph

61. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X₁ are H; Y is CH; Z is H; and Z₁ is ##STR43## 62. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅, R₆, and X, are H; Y is CH; Z is H; Z₁ is ##STR44## 63. R₁, R₅, R₆, X₁, and Z are H; Y is CH; R₂ is CH₂ CH₂ C(O)NH₂ ; and Z₁ is ##STR45## 64. R₁, R₅, R₆, X₁, and Z are H; Y is CH; R₂ is CH₂ CH₂ C(O)NH₂ ; and Z₁ is ##STR46## 65. R₁, R₅, R₆, X₁, and Z are H; Y is CH; R₂ is CH₂ CH₂ C(O)NH₂ ; and Z₁ is ##STR47## 66. R₁, R₅, R₆, X₁, and Z are H; Y is CH; R₂ is CH₂ CH₂ C(O)NH₂ ; and Z₁ is ##STR48## 78. R₁, R₅, R₆ and X₁ are H; Y is CH; R₂ is CH₂ CH₂ C(O)NH₂ ; Z is CH₂ Cl; and Z₁ is H

Compounds 67-69 having the formula X: ##STR49## 67. R₁, R₆, X₁, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z₁ is CO₂ CH₂ CH₃ ; and Ar is Ph

68. R₁, R₅, R₆, X₁, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; and Ar is ##STR50## 69. R₁, R₅, R₆, X₁, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; Z₁ is CO₂ CH₂ CH₃ ; and Ar is ##STR51##

Compounds 70-73 having the formula XI: ##STR52## 70. R₁, R₅, R₆, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₃ is CH₂ Ph; Z₁ is CO₂ CH₂ CH₃ ; and A is ##STR53## 71. R₁, R₅, R₆, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₃ is CH₂ Ph; Z₁ is CO₂ CH₂ CH₃ ; and A is Ph

72. R₁, R₅, R₆, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; A is CH₂ CH(CH₃)₂ ; Z₁ is CO₂ CH₂ CH₃ ; and R₃ is ##STR54## 73. R₁, R₅, R₆, and Z are H; R₂ is CH₂ CH₂ C(O)NH₂ ; A is CH₂ CH(CH₃)₂ ; Z₁ is CO₂ CH₂ CH₃ ; and R₃ is ##STR55##

Compounds 1, 6, 8-10, 15, 20, 23, 38-40, 76, and 77 having the formula XII: ##STR56## 1. R₁ is H; R₂ is CH₂ CH₂ CN; R₅ is H; R₆ is H; Z is F; and Z₁ is CO₂ CH₂ CH₃

6. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is C(O)NHCH₂ CH₃

8. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is F; and Z₁ is CO₂ CH₂ CH₃

9. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is SO₂ Ph

10. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is SO₂ Ph

15. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is CO₂ H

20. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is PO(OCH₂ CH₃)₂

23. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is ##STR57## 38. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is ##STR58## 39. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is ##STR59## 40. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is ##STR60## 76. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is CH₂ OAc

77. R₁ is H; R₂ is CH₂ CH₂ C(O)NH₂ ; R₅ is H; R₆ is H; Z is H; and Z₁ is ##STR61##

Compound 45 having the formula XIII: ##STR62##

Compounds 79-97, also having the formula III: ##STR63## 82. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is CH₃ and Z₁ is CO₂ CH₂ CH₃,

90. R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, and Z and Z₁ together form ##STR64## where C═O is preferably cis to the R₁ group or wherein R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is selected from: ##STR65##

Compounds 98-121 having formula XIV: ##STR66## wherein R₆ is H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is CO₂ CH₂ CH₃, and

98. R₃ is CH₂ Ph and R₄ is ##STR67## 99. R₃ is H and R₄ is ##STR68## 100. R₃ is ##STR69## and R₄ is ##STR70## 101. R₃ is CH₂ Ph and R₄ is ##STR71## 102. R₃ is CH₂ Ph and R₄ is ##STR72## 103. R₃ is ##STR73## and R₄ is ##STR74## 104. R₃ is CH₂ Ph and R₄ is ##STR75## 105. R₃ is ##STR76## and R₄ is ##STR77## 106. R₃ is CH₂ Ph and R₄ is ##STR78## 107. R₃ is CH₂ Ph and R₄ is ##STR79## 108. R₃ is CH₂ CH₃ and R₄ is ##STR80## 109. R₃ is CH₃ and R₄ is ##STR81## 110. R₃ is CH₂ Ph and R₄ is ##STR82## 111. R₃ is CH₂ Ph and R₄ is ##STR83## 112. R₃ is ##STR84## and R₄ is ##STR85## 113. R₃ is ##STR86## and R₄ is ##STR87## 114. R₃ is ##STR88## and R₄ is ##STR89## 115. R₃ is CH₂ Ph and R₄ is ##STR90## 116. R₃ is CH₂ Ph and R₄ is ##STR91## 117. R₃ is CH₂ Ph and R₄ is ##STR92## 118. R₃ is CH₂ Ph and R₄ is ##STR93## 119. R₃ is CH₂ Ph and R₄ is ##STR94## 120. R₃ is CH₂ Ph and R₄ is ##STR95## 121. R₃ is CH₂ CH₂ CO₂ H and R₄ is ##STR96##

Compounds 122-130, also having the formula XIV: ##STR97## wherein R₆ is H, R₁ is H, R₃ is CH₂ Ph and 122. R₂ is CH₂ OC(O)NHC(O)CH₂ Cl, Z is H, Z₁ is CO₂ CH₂ CH₃ and R₄ is ##STR98## 123. R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is CO₂ CH₂ CH₃ and R₄ is ##STR99## 122 . R₂ is CH₂ CHOC(O)NHC, Z is H, Z₁ is ##STR100## and R₄ is ##STR101## 125. R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is NO₂, and R₄ is ##STR102## 126. R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is ##STR103## and R₄ is ##STR104## 127. R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is ##STR105## and R₄ is ##STR106## 128. R₂ is CH₂ CH₂ C(O)N H₂, Z is H, Z₁ is ##STR107## and R₄ is ##STR108## 129. R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is CO₂ CH₂ CH₃ and R₄ is ##STR109## 130. R₂ is CH₂ CH₂ C(O)NH₂, Z and Z₁ together form ##STR110## and R₄ is ##STR111## where C═O is preferably cis to the R₁ group.

Compounds 131-145, also having the formula XIV: ##STR112## wherein R₆ is H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₄ is ##STR113## and 131. R₃ is CH₂ Ph, Z is H and Z₁ is ##STR114## 132. R₃ is ##STR115## Z is H and Z₁ is CO₂ CH₂ CH₃ 133. R₃ is ##STR116## Z is H and Z₁ is CO₂ CH₂ CH₃ 134. R₃ is CH(OH)CH₃, Z is H and Z₁ is CO₂ CH₂ CH₃

135. R₃ is ##STR117## Z is H and Z₁ is CO₂ CH₂ CH₃ 136. R₃ is ##STR118## Z is H and Z₁ is CO₂ CH₂ CH₃ 137. R₃ is CH₂ CH₂ CH₃, Z is H and Z₁ is CO₂ CH₂ CH₃

138. R₃ is CH₂ Ph, Z is H and Z₁ is C(O)N(OH)CH₃

139. R₃ is ##STR119## Z is H and Z₁ is CO₂ CH₂ CH₃ 140. R₃ is ##STR120## Z is H and Z₁ is CO₂ CH₂ CH₃ 141. R₃ is CH₂ CH(CH₃)₂, Z is H and Z₁ is CO₂ CH₂ CH₃

142. R₃ is CH₂ SCH₃, Z is H and Z₁ is CO₂ CH₂ CH₃

143. R₃ is CH₂ SCH₂ CH₃, Z is H, and Z₁ is CO₂ CH₂ CH₃

144. R₃ is CH₂ Ph, Z is CH₃, and Z₁ is CO₂ H,

145. R₃ is CH₂ Ph, Z is H, and Z₁ is ##STR121##

Compounds 146-155, also having the formula XIV: ##STR122## wherein R₆ is H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Z is H, and

146. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR123## 147. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR124## 148. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR125## 149. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR126## 150. Z₁ is ##STR127## R₃ is CH₂ Ph, ard R₄ is ##STR128## 151. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR129## 152. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR130## 153. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR131## 154. Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR132## 155. Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR133## and R₄ is ##STR134##

Compounds 156-173, also having formula XIV: ##STR135## wherein R₆ is H, R₃ is CH₂ Ph, R₂ is CH₂ CH₂ C(O)NH₂, and

156. R₁ is OH, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR136## 157. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR137## 158. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR138## 159. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR139## 160. R₁ is H, Z is H, Z₁ is ##STR140## and R₄ is ##STR141## 161. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR142## 162. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR143## 163. R₁ is H, Z is H, Z₁ is CO₂ CH₂ C(CH₃)₃, and R₄ is ##STR144## 164. R₁ is H, Z and Z₁ together form ##STR145## and R₄ is ##STR146## where C═O is preferably cis to the R₁ group 165. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR147## 166. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR148## 167. R₁ is H, Z is H, Z is CO₂ CH₂ CH₃, and R₄ is ##STR149## 168. R₁ is H, Z is CH₃, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR150## 169. R₁ is H, Z and Z₁ together form ##STR151## and R₄ is ##STR152## where C═O is preferably cis to R₁ 170. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR153## 171. R₁ is H, Z is CH₃, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR154## 172. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR155## 173. R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR156##

Compounds 174-188, also having the formula XIV: ##STR157## wherein R₆ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, and

174. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR158## and R₄ is ##STR159## 175. Z is CH₃, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR160## and R₄ is ##STR161## 176. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR162## and R₄ is ##STR163## 177. Z is CH₃, Z is CO₂ CH₂ CH₃, R₃ is ##STR164## and R₄ is ##STR165## 178. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR166## 179. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR167## 180. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR168## 181. Z and Z₁ together form ##STR169## R₃ is ##STR170## and R₄ is ##STR171## where C═O is preferably cis to the R₁ group 182. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR172## 183. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR173## and R₄ is ##STR174## 184. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR175## and R₄ is ##STR176## 185. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR177## and R₄ is ##STR178## 186. Z is H, Z₁ is CO₂ CH₂ Ph, R₃ is ##STR179## and R₄ is ##STR180## 187. Z is CH₃, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph and R₄ is ##STR181## 188. Z is H, Z₁ is CO₂ CH₂ CH₂ OCH₃, R₃ is ##STR182## and R₄ is ##STR183## 189. R₃ is ##STR184## R₄ is ##STR185## and Z and Z₁ together form ##STR186## where C═O is preferably cis to the R₁ group 190. Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR187## and R₄ is ##STR188##

Other compounds according to the invention include the following compounds of formula III: ##STR189## wherein R₆ is H, R₁ is H, R₃ is CH₂ Ph, R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is selected from the following: ##STR190## wherein VAR is selected from --CH₂ CH₃, --CH(CH₃)₂, --CH₂ CH(CH₃)₂, --CH₂ --Ph, ##STR191##

The present invention is further directed to methods of inhibiting picornaviral 3C protease activity that comprises contacting the protease for the purpose of such inhibition with an effective amount of a compound of formula I or a pharmaceutically acceptable prodrug, salt, or solvate thereof. For example, one can inhibit picornaviral 3C protease activity in mammalian tissue by administering a compound of formula I or II or a pharmaceutically acceptable prodrug, salt, or solvate thereof. More particularly, the present invention is directed to methods of inhibiting rhinoviral protease activity.

The activity of the inventive compounds as inhibitors of picornaviral 3C protease activity may be measured by any of the methods available to those skilled in the art, including in vivo and in vitro assays. Examples of suitable assays for activity measurements include the Antiviral HI-HeLa Cell Culture Assay and the Normal Human Bronchial Epithelial Cell Assay, both described herein.

Administration of the compounds of the formulas I and II, or their pharmaceutically acceptable prodrugs, salts, and solvates, may be performed according to any of the accepted modes of administration available to those skilled in the art. Illustrative examples of suitable modes of administration include, but are not limited to, oral, nasal, parenteral, topical, transdermal and rectal.

The inventive compounds of formulas I and II, and their pharmaceutically acceptable prodrugs, salts, and solvates, may be administered as a pharmaceutical composition in any suitable pharmaceutical form recognizable to the skilled artisan. Suitable pharmaceutical forms include, but are not limited to, solid, semisolid, liquid, or lyopholized formulations, such as tablets, powders, capsules, suppositories, suspensions and aerosols. The pharmaceutical composition may also include suitable excipients, diluents, vehicles and carriers, as well as other pharmaceutically active agents, depending upon the intended use.

Acceptable methods of preparing suitable pharmaceutical forms of the pharmaceutical compositions are known to those skilled in the art. For example, pharmaceutical preparations may be prepared following conventional techniques of the pharmaceutical chemist involving steps such as mixing, granulating and compressing when necessary for tablet forms, or mixing, filling and dissolving the ingredients as appropriate, to give the desired products for oral, parenteral, topical, intravaginal, intranasal, intrabronchial, intraocular, intraural and/or rectal administration.

Solid or liquid pharmaceutically acceptable carriers, diluents, vehicles or excipients may be employed in the pharmaceutical compositions. Illustrative solid carriers include starch, lactose, calcium sulphate dihydrate, terra alba, sucrose, talc, gelatin, pectin, acacia, magnesium stearate, and stearic acid. Illustrative liquid carriers may include syrup, peanut oil, olive oil, saline solution, and water. The carrier or diluent may include a suitable prolonged-release material, such as glyceryl monostearate or glyceryl distearate, alone or with a wax. When a liquid carrier is used, the preparation may be in the form of a syrup, elixir, emulsion, soft gelatin capsule, sterile injectable liquid (e.g. solution), or a nonaqueous or aqueous liquid suspension.

A dose of the pharmaceutical composition contains at least a therapeutically effective amount of the active compound (i.e., a compound of formula I or II or a pharmaceutically acceptable prodrug, salt, or solvate thereof) and preferably is made up of one or more pharmaceutical dosage units. The selected dose may be administered to a mammal, for example, a human patient, in need of treatment mediated by inhibition of 3C protease activity, by any known method of administering the dose including topical, for example, as an ointment or cream; orally, rectally, for example, as a suppository; parenterally by injection; or continuously by intravaginal, intranasal, intrabronchial, intraaural or intraocular infusion.

A "therapeutically effective amount" is intended to mean that amount of a compound of formula I or II that, when administered to a mammal in need thereof, is sufficient to effect treatment for disease conditions alleviated by the inhibition of the activity of one or more picarnoviral 3C proteases, such as human rhinoviruses, human poliovirus, human coxsackieviruses, encephalomyocarditis viruses, menigovirus, and hepatitis A virus. The amount of a given compound of formula I or II that will correspond to a "therapeutically effective amount" will vary depending upon factors such as the particular compound, the disease condition and the severity thereof, the identity of the mammal in need thereof, but can nevertheless be readily determined by one of skill in the art.

"Treating" or "treatment" is intended to mean at least the mitigation of a disease condition in a mammal, such as a human, that is alleviated by the inhibition of the activity of one or more picarnoviral 3C proteases, such as human rhinoviruses, human poliovirus, human coxsackieviruses, encephalomyocarditis viruses, menigovirus, and hepatitis A virus, and includes:

(a) prophylactic treatment in a mammal, particularly when the mammal is found to be predisposed to having the disease condition but not yet diagnosed as having it;

(b) inhibiting the disease condition; and/or

(c) alleviating, in whole or in part, the disease condition.

The inventive compounds, and their salts, solvates, and prodrugs, may be prepared by employing the techniques available in the art using starting materials that are readily available. Certain novel and exemplary methods of preparing the inventive compounds are described below.

Preferably, the inventive compounds of formulas I and II are prepared by the novel X methods of the present invention, including the four general methods shown below. In each of these general methods, R₁, R₂, R₃, R₄, R₅, R₆, Z, and Z₁ are as defined above. ##STR192##

In General Method I, protected amino acid A, where P₁ is an appropriate protecting group for nitrogen, is subjected to an amide forming reaction with amino alcohol (or salt thereof) B to produce amide C. Amide C is then deprotected to give free amine (or salt thereof) D. Amine D and compound F, where "Lv" is an appropriate leaving group, are subjected to a bond forming reaction generating compound F. Compound F is oxidized to intermediate G, which is then transformed into unsaturated product H. If protecting groups are used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

An alternative method to prepare intermediate F is described as follows: ##STR193##

Compound E and amino acid (or salt thereof) I, where P₂ is an appropriate protecting group for oxygen, are subjected to a bond forming reaction to produce intermediate J. Intermediate J is deprotected to yield free carboxylic acid K, which is subsequently subjected to an amide forming reaction with amino alcohol (or salt thereof) B to generate intermediate F.

Amino alcohol B can be prepared as follows: ##STR194##

Amino acid L, where P₁ is an appropriate protecting group for nitrogen, is converted to carbonyl derivative M, where "Lv" is a leaving group. Compound M is subjected to a reaction where "Lv" is reduced to protected amino alcohol Q. Amino alcohol Q is deprotected to give amino alcohol B. ##STR195##

In General Method II, amino acid L, where P, is an appropriate protecting group for nitrogen, is converted to a carbonyl derivative M, where "Lv" is a leaving group. Compound M is subjected to a reaction where "Lv" is replaced by R₁ to give derivative N. Derivative N is then transformed into unsaturated product O. Unsaturated compound O is deprotected to give free amine (or salt thereof) P, or modified one or more times at R₂, R₅, Z and/or Z₁ to give one or more modified O compounds.

Modified O is then deprotected to give amine (or salt thereof) P. Amine P is subsequently subjected to an amide forming reaction with carboxylic acid K, prepared as described in General Method I, to give final product H. If protecting groups were used on any R group (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

An alternative method to prepare intermediate N is described as follows: ##STR196##

Compound M is subjected to a reaction where "Lv" is reduced to protected amino alcohol Q. Amino alcohol Q is subsequently oxidized to derivative N. ##STR197##

In General Method III, amino acid L, where P₁ is an appropriate protecting group for nitrogen, is converted to a carbonyl derivative M, where "Lv" is a leaving group. Derivative M is deprotected to give free amine (or salt thereof) R, which subsequently is subjected to an amide forming reaction with carboxylic acid K to give intermediate S. Intermediate S is then either converted directly to carbonyl intermediate G, or successively reduced to alcohol F, which is then oxidized to G. Intermediate G is subjected to a reaction to yield the unsaturated final product H. If protecting groups were used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H." ##STR198##

In General Method IV, free amine (or salt thereof) P, prepared from intermediate O as described in General Method II, is converted to amide T by reaction with amino acid A, where P₁ is an appropriate protecting group for nitrogen. Compound T is farther deprotected to free amine (or salt thereof) U, which is subsequently converted to H with reactive intermediate E. If protecting groups were used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

Preferably the compound of formulas I or II can be prepared by one of four specific methods. For example, compounds 4, 12, 14, 16, 20, 23, 24, 26-30, 35, and 36 can be prepared by Specific Method I: ##STR199##

In Specific Method I, carboxylic acid K, CBZ-L-Leu-L-Phe, which can be purchased from Bachem or prepared as described in General Method I, is subjected to an amide forming reaction with amino alcohol (or salt thereof) B to generate intermediate F. Intermediate F is oxidized to intermediate G, which is then transformed into unsaturated product H. In the case of Compound 12, intermediate F is oxidized to modified F, which is then oxidized to intermediate G. If protecting groups were used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

For example, compounds 1-3, 6-11, 17-19, 21, 22, 25, 37-40, and 74-77 can be prepared by Specific Method II: ##STR200##

In Specific Method II, intermediate P (or salt thereof), prepared as described in General Method II, is subjected to an amide forming reaction with carboxylic acid K, CBZ-L-Leu-L-Phe, which can be purchased from Bachem or prepared as described in General Method I, to give final product H. If protecting groups were used on any R group (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

For example, compounds 5, 13, and 15 can be prepared by Specific Method III: ##STR201##

In Specific Method III, free amine (or salt thereof) R, prepared as described in General Method III, is subjected to an amide forming reaction with carboxylic acid K, CBZ-L-Leu-L-Phe, which can be purchased from Bachem or prepared as described in General Method I, to give intermediate S. Intermediate S is then either converted directly to carbonyl intermediate G, in the case of compounds 13 and 15, or reduced to alcohol F, which is then oxidized to intermediate G, in the case of compound 5. Intermediate G is subjected to a reaction to yield the unsaturated final product H. If protecting groups were used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

For example, compounds 31-34 can be prepared by Specific Method IV: ##STR202##

In Specific Method IV, free amine (or salt thereof) P, prepared as described in General Method II, is converted to amide T by reaction with protected amino acid A, which can be purchased from Bachem, Advanced Chemtech, and Synthetech. Compound T is further deprotected to free amine (or salt thereof) U, which is subsequently converted to H with reactive intermediate E. If protecting groups were used on any R groups (R₁ -R₆) and/or on Z and/or Z₁, product H is deprotected and/or further modified to yield "deprotected or modified H."

Suitable protecting groups for nitrogen are recognizable to those skilled in the art and include, but are not limited to benzyloxycarbonyl, t-butoxycarbonyl, 9-fluorenylmethoxycarbonyl, p-methoxybenxyloxycarbonyl, trifluoroacetamnide, and p-toluenesulfonyl. Suitable protecting groups for oxygen are recognizable to those skilled in the art and include, but are not limited to --CH₃, --CH₂ CH₃, tBu, --CH₂ Ph, --CH₂ CH═CH₂, --CH₂ OCH₂ CH₂ Si(CH₃)₃, and --CH₂ CCl₃. Other examples of suitable protecting groups for nitrogen or oxygen can be found in T. Green & P. Wuts, Protective Groups in Organic Synthesis (2nd ed. 1991), which is incorporated herein by reference.

Suitable leaving groups are recognizable to those skilled in the art and include, but are not limited to, Cl, Br, I, sulfonates, O-alkyl groups, ##STR203##

Other examples of suitable leaving groups are described in J. March, Advanced Organic Chemistry, Reactions, Mechanisms, and Structure (4th ed. 1992) at pages 205, 351-56, 642-43, 647, 652-53, 666, 501, 520-21, 569, 579-80, 992-94, 999-1000, 1005, and 1008, which are incorporated herein by reference.

EXAMPLES

Examples of the processes used to make several of the compounds of formulas I and II are set forth below. The structures of the compounds of the following Examples were confirmed by one or more of the following: proton magnetic resonance spectroscopy, infrared spectroscopy, elemental microanalysis, mass spectrometry, thin layer chromatography and melting point.

Proton magnetic resonance (NMR) spectra were determined using a Tech-Mag or Varian UNITYplus 300 spectrometer operating at a field strength of 300 megahertz (MHz). Chemical shifts are reported in parts per million (6) and setting the references such that in CDCl₃ the CHCl₃ is at 7.26 ppm, in acetone-d₆ the acetone is at 2.02 ppm, and in DMSO-d₆ the DMSO is at 2.49 ppm. Peak multiplicities are designated as follows: s, singlet; d, doublet; dd, doublet of doublets; ddd, doublet of doublet of doublets; t, triplet; q, quartet; bs, broad singlet; bt, broad triplet; m, multiplet. Mass spectra (FAB; fast atom bombardment) were determined at the Scripps Research Institute Mass Spectometry Facility, San Diego, Calif. Infrared absorption (1R) spectra were taken on a MIDAC Corporation FTIR or a Perkin-Elmer 1600 series FTIR spectrometer.

Elemental microanalysis were performed by Atlantic Microlab Inc. Norcross, Ga. and gave results for the elements stated with ±0.4% of the theoretical values. Flash chromatography was performed using Silica gel 60 (Merck Art 9385). Thin layer chromatographs (TLC) were performed on precoated sheets of silica 60 F₂₅₄ (Merck Art 5719). Melting points were determined on a Mel-Temp apparatus and are uncorrected. Anhydrous N,N-Dimethylformamide (DMF), N,N-dimethylacetamide (DMA), dimethysulfoxide (DMSO), were used as is. Tetrahydrofuran (THF) was distilled from sodium benzophenone ketyl under nitrogen.

Et₂ O refers to diethyl ether. Pet. ether refers to petroleum ether having a boiling range of 36°-53° C. TFA refers to trifluoroacetic acid. Et₃ N refers to triethylamine. Other abbreviations include: methanol (MeOH), ethanol (EtOH), ethyl acetate (EtOAc), acetyl (Ac), methyl (Me), phenyl (Phe), triphenylmethyl (Tr), benzyloxycarbonyl (CBZ), tert-butoxycarbonyl (BOC), m-chloroperoxybenzoic acid (m-CPBA), alanine (Ala), glutamine (Gln), leucine (Leu), methionine (Met), phenylalanine (Phe), penicillamine (Pen). Additionally, "L" represents natural amino acids, "D" represent unnatural amino acids, and "DL" represents racemic mixtures.

A simplified naming system was used to identify intermediates and final products. Amino acid and peptide alcohols are given the suffix `ol` (for example methioninol). Amino acid and peptide aldehydes are given the suffix `al` (for example methioninal). When naming final products, italicized amino acid abbreviations represent modifications at the C-terminus of that residue where the following apply:

1. acrylic acid esters are reported as either "E" (trans) or "Z" (cis) propenoates,

2. acrylonitriles are reported as either E or Z propenonitriles,

3. acrylamides are reported as either E or Z propenamides, except in the case of the compound 21, which is reported as 1-Pyrrolidin-1-yl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenone,

4. vinyl sulfones, vinyl phosphonates, or vinyl aryls are reported as E or Z vinyl sulfones, vinyl phosphonates or aryls, and

5. vinyl ketones are reported as either E or Z en-2-ones.

Example 1 Preparation of Compound 12: Ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)!-E-Propenoate

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-Methioninol

CBZ-L-Leu-L-Phe (3.02 g, 7.3 mmol) was dissolved in 75 mL of CH₂ Cl₂. To this solution was added N-hydroxysuccinimide (0.91 g, 7.7 mmol) and 2 mL of DMF, and stirring was continued until all solids had gone into solution. N,N'-Dicyclohexylcarbodiimide (1.60 g, 7.7 mmol) was added to the reaction mixture, and the reaction was stirred at room temperature for one hour. The mixture was then filtered into a separate flask containing S-(-)-methioninol (1.06 g, 7.7 mmol) dissolved in a minimum of DMF, removing the N,N'-dicyclohexylurea precipitate. The reaction was allowed to stir overnight at room temperature. The solvents were removed under vacuum, and the resulting crude product was purified by flash chromatography (anhydrous NH₃ /MeOH/CHCl₃, 0.5:4.5:9.5) on silica gel to give 3.72 g (96%) of white solid: IR (KBr) 3293, 3065, 2955, 1696, 1645, 1539, 1236, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (m, 6 H), 1.31 (m, 2 H), 1.51 (m, 2 H), 1.82 (m, 1 H), 2.00 (s, 3 H), 2.43 (m, 2 H), 2.78-3.29 (m, 4 H), 3.72 (m, 1H), 3.97 (m, 1 H), 4.45 (m, 1 H), 4.66 (t, 1 H, J=5.5 Hz), 5.01 (s, 2 H), 7.15-7.39 (m, 10 H), 7.43 (d, 1H, J=8.1 Hz), 7.62 (d, 1 H, J=8.5 Hz), 7.95 (d, 1 H, J=8.1 Hz). Anal. (C₂₈ H₃₉ N₃ O₅ S) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-Methioninol (sulfoxide)

CBZ-L-Leu-L-Phe-L-methioninol (1.50 g, 2.80 mmol) was dissolved in 50 mL of CH₂ Cl₂. A total amount of 0.61 g (3.5 mmol) of m-CPBA was added portionwise over a period of five hours as the reaction was stirred at room temperature. After an additional hour, the reaction was poured into saturated NaHCO₃ /CH₂ Cl₂. The organic layer was separated, washed with brine, and dried (Na₂ SO₄). After removal of the solvent, the crude residue was flash chromatographed on a short flash silica gel column eluting with 5% MeOH/CHCl₃. The product was obtained as a white glassy solid (1.38 g, 90%): IR (KBr) 3295, 3063, 2955, 1694, 1644, 1541, 1263, 1234, 1043, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.81 (m, 6 H), 1.32 (m, 2 H), 1.59 (m, 2 H), 1.92 (m, 1H), 2.47 (s, 3 H), 2.55-3.29 (m, 6 H), 3.73 (m, 1 H), 3.97 (m, 1 H), 4.42 (m, 1 H), 4.75 (t, 1 H, J=5.5 Hz), 5.01 (m, 2 H), 7.16-7.39 (m, 10 H), 7.44 (d, 1 H, J=7.7 Hz), 7.73 (d, I H, J=8.8 Hz), 7.98 (m, 1 H). Anal. (C₂₈ H₃₉ N₃ O₆ S) C, H, N, S.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-Methioninal (sulfoxide)

CBZ-L-Leu-L-Phe-L-methioninol (sulfoxide) (1.38 g, 2.53 mmol) was dissolved in DMSO. o-Iodoxybenzoic acid (2.12 g, 7.59 mmol) was added, requiring a few minutes of stirring at room temperature to dissolve. After three hours, the DMSO was removed under reduced pressure. The residue was twice diluted with CH₂ Cl₂, and the solvent was evaporated to remove any residual DMSO. The residue was diluted with a minimum of acetone, and the white precipitate was filtered off. The filtrate was concentrated to near dryness and dissolved in EtOAc, which produced more of the white precipitate, which was again filtered off. The filtrate was washed with a 10% Na₂ S₂ O₃ /10% NaHCO₃ solution, water, and brine before drying over Na₂ SO₄. Upon removal of the organic solvent, the residue was twice taken up in benzene and evaporated to remove any residual water, giving 0.98 g (71%) of a white glassy solid which was used immediately without further purification: ¹ H NMR (DMSO-d₆) δ 0.81 (m, 6H), 1.30 (m, 2H), 1.50 (m, 1H), 1.97 (m, 1H), 2.48 (s, 3H), 2.55-3.27 (m, 5H), 3.70 (m, 1H), 4.47 (m, 1H), 4.71 (m, 1H), 5.00 (s, 2H), 7.20-7.40 (m, 1OH), 7.93 (m, 1H), 8.08 (m, 1H), 8.51 (m, 1H), 9.22 (s, 1H); (M+H) 544.

Preparation of Product--Ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)!-E-Propenoate

CBZ-L-Leu-L-Phe-L-Methioninal (sulfoxide) (0.98 g, 1.80 mmol) was dissolved in 50 mL of THF. (Carbethoxymethylene)triphenyl-phosphorane (1.11 g, 2.16 mmol) was added, and the reaction was stirred at room temperature overnight. The solvent was removed in vacuo, and the residue subjected to flash column chromatography eluting with 2% MeOH/CHCl₃. The product was obtained (0.82 g, 74%) as a white solid: ¹ H NMR (DMSO-d₆) δ 0.81 (m, 6H), 1.21 (t, 3H, J=7 Hz), 1.34 (m, 2H), 1.54 (m, 1H), 1.78 (m, 1H), 1.93 (m, 1H), 2.49 (s, 3H), 2.50-3.05 (m, 4H), 3.99 (m, 1H), 4.10 (q, 2H, J=7 Hz), 4.51 (m, 2H), 5.00 (dd, 2H, J=17.3, 4.4 Hz), 5.62 (m, 1H), 6.72 (m, 1H), 7.19 (m, 5H), 7.34 (m, 5H), 7.43 (d, 1H, J=8.1 Hz), 8.08 (d, 1H, J=7.4 Hz), 8.13 (d, 1H, J=8.5 Hz); (M+H) 614; HRMS calcd for C₃₂ H₄₃ N₃ O₇ S+Cs 746.1876 (M+Cs), found 746.1850. Anal. (C₃₂ H₄₃ N₃ O₇ S) C, H, N, S.

Example 2 Preparation of Compound 4: Ethyl-3- CBZ-L-Leu-L-Phe-L-(-Ac-amino)-Ala!-E-Propenoate

Preparation of Intermediate CBZ-L-(N-Ac-amino)-Ala

CBZ-L-Amino-Ala (1.5 g, 6.3 mmol) was suspended in 50 mL of H₂ O with stirring. Acetic anhydride (5.0 mL) was added slowly to this suspension over a 30 minute period, during which time the starting material dissolved. The reaction mixture was stirred for an additional 1 hour at room temperature and then evaporated to dryness under vacuum. The resulting oil was dissolved in 30 mL CHCl₃ and left for 12 hours. The solid that formed was collected by filtration, washed with 30 mL of CHCl₃ and dried yielding 1.29 g (73%) of product as a white solid: IR (KBr) 3271, 3125, 3065, 1734, 1703, 1614, 1545, 1289, 1244, 1053, 727 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.84 (s, 3H), 3.2-3.55 (m 2H), 4.13 (m, 1H), 5.08 (s, 2H), 7.12-7.41 (m, 5H), 7.54 (d, 1H, J=8.1 Hz), 8.02 (bt, 1H, J=5.5 Hz), 12.78 (bs, 1H); Anal. (C₁₃ H₁₆ N₂ O₅) C, H, N.

Preparation of Intermediate CBZ-L-(N-Ac-amino)-Ala-OMe

Anhydrous HCl gas was slowly bubbled at 0° C. into a stirred suspension of CBZ-L-(N-Ac-amino)-Ala (1.21 g, 4.3 mmol) in MeOH (43 mL) until the solid was dissolved. Stirring was continued for 30 minutes at 0° C. whereupon the methanolic HCl was carefully evaporated to dryness. The methyl ester was formed as a white solid in quantitative yield and used without further purification: IR (KBr) 3323, 3285, 3094, 2957, 1755, 1736, 1686, 1651, 1531, 1277, 1057, 736, 600 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.78 (s, 3H), 3.22-3.47 (m, 2H), 3.61 (s, 3H), 4.15 (m, 1H), 5.02 (s, 2H), 7.24-7.36 (m, 5H), 7.64 (d, 1H, J=7.7 Hz), 7.97 (bt, 1H, J=6.3 Hz); Anal. (C₁₄ H₁₈ N₂ O₅) C, H, N.

Preparation of Intermediate CBZ-L-(N-Ac-amino)-Alaninol

To a solution of CBZ-L-(N-Ac-amino)-Ala-OMe (1.8 g, 6.12 mmol) in 50 mL anhydrous THF/EtOH (2:1) was added LiCl (0.52 g, 12.24 mmol). Upon dissolution, NaBH₄ (0.46 g, 12.24 mmol) was added, and the mixture was stirred at room temperature for 12 hours. The reaction mixture was evaporated to near dryness, whereupon 45 mL of H₂ O was added. The pH of this mixture was adjusted to 2-3 using concentrated HCl, followed by extraction with EtOAc (300 mL). The organic layer was washed with H₂ O (50 mL), dried over Na₂ SO₄, filtered and concentrated. The residue was purified by flash column chromatography (10% MeOH/CHCl₃) to give 1.38 g (85%) of a white solid: IR (KBr) 3303, 3082, 2951, 2926, 1689, 1645, 1547, 1284, 1061, 1046, 756, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.78 (s, 3H), 3.03 (m, 1H), 3.16-3.28 (m, 3H), 3.49 (m, 1H), 5.00 (s, 2H), 6.95 (d, 1H, J=8.1 Hz), 7.29-7.38 (m, 5H), 7.83 (bt, 1H, J=5.5 Hz); Anal. (C₁₃ H₁₈ N₂ O₄) C, H, N.

Preparation of Intermediate L-(N-Ac-amino)-Alaninol

To a solution of CBZ-L-(N-Ac-amino)-alaninol (1.36 g, 5.11 mmol) in 40 mL MeOH, 10% Pd on carbon (0.15 g) was added with stirring while under an argon atmosphere. The reaction vessel was evacuated under vacuum and then put under an atmosphere of hydrogen using a balloon. The mixture was stirred for 2 hours. At this time the hydrogen gas was evacuated, and the catalyst was removed by filtration. The solvent was removed under vacuum. Addition of EtOAc and reconcentration gave a white hygroscopic solid in quantitative yield which was used without further purification: mp=80°-82° C.; ¹ H NMR (DMSO-d₆) δ 1.79 (s, 31), 2.66 (m, 1H), 2.86 (m, 1H), 3.06 (m, 1H), 3.21 (2H, m), 3.4 (bs, 2H), 4.55 (bs, 1H), 7.76 (bs, 1H). Anal. (C₅ H₁₂ N₂ O₂) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-Alaninol

This compound was prepared from CBZ-L-Leu-L-Phe and L-(N-Ac-amino)-alaninol using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninol. The compound was purified by column chromatography (7% MeOH/CHCl₃) to give a white solid (81%): IR (KBr) 3302, 2955, 1694, 1651, 1539, 1454, 1236, 1047, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (s, 6H), 1.32 (m, 2H), 1.47 (m, 1H), 1.79 (s, 3H), 2.81 (m, 1H), 2.97 (m, 2H), 3.14-3.25 (m,. 3H), 3.71 (m, 1H), 3.95 (m, 1H), 4.42 (m, 1H), 4.67 (t, 1H, J=5.5 Hz), 5.00 (m, 2H), 7.16-7.34 (m, 101H), 7.45 (d, 1H, J=8.1 Hz), 7.70 (m, 2H), 7.88 (d, 1H, J=8.1 Hz); Anal. (C₂₈ H₃₈ N₄ O₆) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-Alaninal

This compound was prepared in 73% yield as a white solid from CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-alaninol using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide). The product was used immediately without further purification. The product existed as a mixture of aldehyde and aldehyde hydrate. IR (KBr) 3294, 2957, 1695, 1649, 1539, 1263, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.81 (dd, 6H, J=8.8, 6.2 Hz), 1.31 (m, 2H), 1.50 (m, 1H), 1.76 (s, hydrate), 1.78 (s, 3H), 2.83 (m, 1H), 3.00 (m, 1H), 3.20 (d, J=9.6 Hz, hydrate), 3.35 (m, 1H), 3.80 (m, hydrate), 3.97 (m, 2H), 4.16 (m, 1H), 4.37 (m, hydrate), 4.44 (m, hydrate), 4.54 (m, 1H), 5.01 (s, 2H), 6.28 (d, 1H, J=7.0 Hz, hydrate), 6.41 (d, 1H, J=6.6 Hz, hydrate), 7.12-7.50 (m, 10H), 7.63 (t, 1H, J=7.9 Hz), 7.87 (m, 1H), 7.98 (d, 1H, J=8.1 Hz), 8.40 (d, 1H, J=7.0 Hz), 9.26 (s, 1H); Anal. (C₂₈ H₃₆ N₄ O₆.0.5 H₂ O) C, H, N.

Preparation of Product--Ethyl-3- CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-Ala!-E-Propenoate

This compound was prepared in 55% yield as a white solid from CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-alaninal and (carbethoxymethylene)triphenylphosphorane using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate. The product was purified by flash column chromatography (3% MeOH/CHCl₃). ¹ H NMR (DMSO-d₆) δ 0.81 (dd, 6H, J=9.2, 6.6 Hz), 1.21 (t, 3H, J=7.2 Hz), 1.34 (m, 2H), 1.53 (m, 1H), 1.78 (s, 3H), 2.80-3.28 (m, 4H), 3.99 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.43 (m, 2H), 5.01 (m, 2H), 5.61 (d, 1H, J=15.4 Hz), 6.61 (dd, 1H, J=15.4, 5.2 Hz), 7.10-7.34 (m, 10H), 7.44 (d,1H, J=7.7 Hz), 7.70 (m, 2H), 7.82 (t, 1H, J=5.5 Hz), 8.05 (m, 2H); HRMS calcd for C₃₂ H₄₂ N₄ O₇ +Cs 727.2108 (M+Cs), found 727.2137. Anal. (C₃₂ H₄₂ N₄ O₇) C, H, N.

Example 3 Preparation of Compound 2: Ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Preparation of Intermediate BOC-L-(Tr-Gln)-N(Me)OMe

Isobutyl chloroformate (0.611 mL, 4.71 mmol) was added to a solution of BOC-L-(Tr-Gln) (2.30 g, 4.71 mmol) and 4-methylmorpholine (1.04 mL, 9.46 mmol) in CH₂ CL₂ at 0° C. The reaction mixture was stirred at 0° C. for 20 minutes then N,O-dimethylhydroxylamine hydrochloride (0.459 g, 4.71 mmol) was added. The resulting solution was stirred at 0° C. for 15 minutes and at 23° C. for 4 hours, then was partitioned between water (150 0mL) and a 1:1 mixture of EtOAc and hexanes (2×150 mL). The combined organic layers were dried over Na₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (40% hexanes in EtOAc) afforded the product (2.22 g, 89%) as a white foam: R_(f) =0.22 (50% EtOAc in hexanes); IR (KBr) 3411, 3329, 3062, 1701, 1659 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.42 (s, 9H), 1.63-1.77 (m, 1H), 2.06-2.17 (m, 1H), 2.29-2.43 (m, 2H), 3.17 (s, 3H), 3.64 (s, 3H), 4.73 (bs, 1H), 5.38-5.41 (m, 1H), 7.20-7.31 (m, 15H); Anal. (C₃₁ H₃₇ N₃ O₅) C, H, N.

Preparation of Intermediate BOC-L-(Tr-Glutaminal)

Diisobutylaluminum hydride (7.84 mL of 1.5M solution in toluene, 11.76 mmol) was added to a solution of BOC-L-(Tr-Gln)-N(Me)OMe (2.50 g, 4.70 mmol) in THF at -78° C., and the reaction mixture was stirred at -78° C. for 4 hours. Methanol (3 mL) and 1.0M HCl (6 mL) were added sequentially, and the mixture was warmed to 23° C. The resulting suspension was diluted with Et₂ O (150 mL) and was washed with 1.0M HCl (3×100 mL), half-saturated NaHCO₃ (100 mL), and water (100 mL). The organic layer was dried over MgSO₄, filtered, and concentrated to give crude aldehyde (2.01 g, 91%) as a white solid: mp=114°-116° C.; R_(f) =0.42 (50% EtOAc in hexanes); IR (KBr) 3313, 1697, 1494 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.44 (s, 9H), 1.65-1.75 (m, 1H), 2.17-2.23 (m, 1H), 2.31-2.54 (m, 2H), 4.11 (bs, 1H), 5.38-5.40 (m, 1H), 7.11 (s, 1H), 7.16-7.36 (m, 15H), 9.45 (s, 1H).

Preparation of Intermediate Ethyl-3- BOC-L-(Tr-Gln)!-E-Propenoate

Sodium bis(trimethylsilyl)amide (3.38 mL of a 1.0M solution in THF, 3.3 mmol) was added to a solution of triethyl phosphonoacetate (0.732 mL, 3.39 mmol) in THF (100 mL) at -78° C., and the resulting solution was stirred for 20 minutes at that temperature. BOC-L-(Tr-Glutaminal) (1.60 g, 3.39 mmol) in THF (20 mL) was added via cannula, and the reaction mixture was stirred for 4 hours at -78° C. then was partitioned between 1.0M 5HCl (150 mL) and a 1:1 mixture of EtOAc and hexanes (2×150 mL). The organic layers were dried over Na₂ SO₄ and concentrated. Purification of the residue by flash column chromatography (40% EtOAc in hexanes) provided ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate (1.53 g, 83%) as a white foam: R_(f) =0.60 (50% EtOAc in hexanes); IR (cm⁻¹) 3321, 1710; ¹ H NMR (CDCl₃) δ 1.27 (t, 3 H, J=7.2 Hz), 1.42 (s, 9H), 1.70-1.78 (m, 1H), 1.80-1.96 (m, 11H), 2.35 (t, 2H, J=7.0 Hz), 4.18 (q, 2H, J=7.2 Hz), 4.29 (bs, 1H), 4.82-4.84 (m, 1H), 5.88 (dd, 1H, J=15.7, 1.6 Hz), 6.79 (dd, 1H, J=15.7, 5.3 Hz), 6.92 (s, 1H), 7.19-7.34 (m, 15H); Anal. (C₃₃ H₃₈ N₂ O₅) C, H, N.

Preparation of Product Ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.224 g, 0.422 mmol) was dissolved in 1,4-dioxane (3 ) mL) and cooled to 0° C. A solution of HCl in 1,4-dioxane (4.0M, 3 mL, 12 mmol) was added dropwise, and the reaction solution was allowed to warm to room temperature. After being stirred for 2 hours, the solution was diluted with 1:1 CH₂ Cl₂ /EtOAc (50 mL) and added to a solution of NaOH (16 mmol) in saturated aqueous NaHCO₃ (50 mL). After vigorous shaking, the phases were separated, and the aqueous phase was washed 2 more times with 1:1 CH₂ Cl₂ /EtOAc (50 mL). The combined organic phases were dried over Na₂ SO₄ and concentrated to give 0.164 g (88%) of the crude free amine, which was used without further purification.

The crude amine (0.371 mmol, 1.0 equiv) was dissolved in dry CH₂ Cl₂ (5 mL). CBZ-L-Leu-L-Phe (0.176 g, 0.427 mmol), 1-hydroxybenzotriazole hydrate (0.081 g, 0.599 mmol), 4-methylmorpholine (0.175 mL, 1.59 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.114 g, 0.595 mmol) were added sequentially. After being stirred for 18 hours at 23° C., the reaction mixture was poured into water (40 mL) and extracted with 1:1 CH₂ Cl₂ /EtOAc (3×50 mL). The combined organic layers were dried over Na₂ SO₄ and were concentrated. The residue was purified by flash column chromatography (50% EtOAc in hexanes) to give the product (0.163 g, 49%) as a white solid: mp=192°-194° C.; IR (KBr) 3295, 3049, 1696, 1654 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (d, 3H, J=6.5 Hz), 0.86 (d, 3H, J=6.5 Hz), 1.24-1.32 (mi, 1H), 1.28 (t, 3H, J=7.2 Hz), 1.43-1.75 (m, 3H), 1.91-2.06 (m, 1H), 2.20-2.38 (m, 2H), 2.93-3.02 (m, 3H), 3.07-3.18 (m, 1H), 3.95-4.02 (m, 1H), 4.17 (q, 2H, J=7.2 Hz), 1.43-4.55 (m, 2H), 4.82-4.95 (m, 2H), 5.69 (d, 1H, J=15.7 Hz), 6.46 (d, 1H, J=7.5 Hz), 6.60 (d, 1H, J=8.1 Hz), 6.69 (dd, 1H, J=15.7, 5.1 Hz), 7.09-7.38 (m, 27 H); Anal. (C₅₁ H,₆ N₄ O₇) C, H, N.

Example 4 Preparation of Compound 3: Ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Preparation of Product--Ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Compound 2, ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.15 g, 0.18 mmol), prepared as described in Example 3, was dissolved in 1 :1 CH₂ Cl₂ /TFA (5 mL) at 23° C. and the bright yellow solution was stirred 30 minutes, whereupon the solvent was evaporated. CCl₄ (10 mL) was added, and the resulting solution was concentrated twice. Addition of Et₂ O (10 mL) to the oily residue quickly gave a white precipitate. After stirring 10 minutes, the solid was collected by filtration and washed sequentially with acetone (2×10 mL) and Et₂ O (2×10 mL) then was dried in vacuo to give ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate (0.057 mg, 53%) as a white solid: mp=219°-221° C.; IR (KBr) 3300, 3065, 1672 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (d, 3H, J=6.8 Hz), 0.82 (d, 3H, J=6.5 Hz), 1.21 (t, 3H, J=7.0 Hz), 1.25-1.37 (m, 2H), 1.42-1.54 (m, 1H), 1.58-1.80 (m, 2H), 2.02-2.09 (m, 2H), 2.84 (dd, 1H, J=13.2, 8.9 Hz), 2.97 (dd, 1H, J=13.2,-5.8 Hz), 3.93-4.01 (m, 1H), 4.11 (q, 2H, J=7.0 Hz), 4.33-4.52 (m, 2H), 4.97 (d, 1H, J=12.3 Hz), 5.04 (d, 1H J=12.3 Hz), 5.64 (d, 1H, J=15.9 Hz), 6.69 (dd, 1H, J=15.9, 5.4 Hz), 6.76 (s, 1H), 7.13-7.37 (m, 1H), 7.43 (d, 1H, J=7.8 Hz), 7.99 (d, 1H, J=8.1 Hz), 8.04 (d, 1H, J=8.1 Hz); Anal. (C₃₂ H₄₂ N₄ O₇) C, H, N.

Example 5 Preparation of Compound 7: Methyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-Z-Propenoate

Preparation of Intermediate Methyl-3- BOC-L-(Tr-Gln)!-Z-Propenoate

18-crown-6 (0.867 g, 3.28 mmol) was evaporated from toluene (40 mL) and then dissolved in dry THF (14 mL) under argon. Bis(2,2,2-trifluoroethyl)(methoxycarbonylmethyl)phosphonate (0.111 mL, 0.525 mmol) was added, and the reaction mixture was cooled to -78° C. After dropwise addition of a solution of potassium bis(trimethylsilyl)-amide in toluene (0.5M, 1.26 mL, 0.63 mmol), the reaction mixture was stirred for 25 minutes. A solution of BOC-L-(Tr-glutaminal) (0.310 g, 0.656 mmol) in dry THF (4 mL) was added dropwise, and, after stirring 1 hour more, saturated aqueous NH₄ Cl (2 mL) was added. The reaction mixture was allowed to warm to room temperature, and the THF was evaporated. Water (10 mL) was added to the residue, which was then extracted with CH₂ Cl₂ (3×30 mL). The combined organic phases were dried over Na₂ SO₄ and concentrated. The residue was purified by flash column chromatography (35% EtOAc/hexanes) to give the product (0.181 g, 52%) as a glass: IR (thin film) 3326, 1713, 1690, 1666, 1514 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.41 (s, 9H), 1.84-1.93 (m, 2H), 2.37-2.44 (m, 2H), 3.68 (s, 3H), 5.10 (m, 2H), 5.80 (d, 1H, J=11.8 Hz), 6.03 (m, 1H), 6.88 (bs, 1H), 7.18-7.32 (m, 15H).

Preparation of Intermediate Methyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-Z-Propenoate

Methyl-3- BOC-L-(Tr-G an)!-Z-propenoate (0.143 g, 0.271 mmol) was dissolved in 1,4-dioxane (3 mL) at room temperature. A solution of HCl in 1,4-dioxane (4.0M, 3 mL) was added dropwise, and the reaction solution was stirred for 2 hours under an argon balloon. Then the solvent was evaporated to give the crude amine salt as a glassy residue, which was used without further purification. This amine salt, CBZ-L-Leu-L-Phe (0.112 g, 0.272 mmol), and 1-hydroxybenzotriazole hydrate (0.055 g, 0.40 mmol) were dissolved in dry CH₂ Cl₂ (5 mL) under argon at room temperature. 4-Methylmorpholine (0.149 mL, 1.36 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.078 g, 0.40 mmol) were then added sequentially. After stirring for 3 hours, water (10 mL) was added, and the mixture was extracted with CH₂ Cl₂ (3×30 mL). The combined organic phases were dried over Na₂ SO₄ and concentrated. The residue was purified by flash column chromatography (33% acetone in hexanes) to give the product (0.132 g, 59%) as a white foam: IR (thin film) 3296, 1708, 1650, 1517 cm⁻¹ ; Anal. (C₅₀ H₅₄ N₄ O₇) C, H, N.

Preparation of Product--Methyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-Z-Propenoate

Methyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-Z-propenoate (0.110 g, 0.134 mmol) was dissolved in 1:1 CH₂ Cl₂ /TFA (4 mL), giving a bright yellow solution, which was stirred for 30 minutes under an argon balloon. CCl₄ (7 mL) was added, and the solution was concentrated twice. The residue was triturated with Et₂ O (3 mL) to give a white solid, which was collected by filtration and dried in vacuo (0.040 g, 51%): mp=185°-188° C.; IR (KBr) 3401, 3283, 1719, 1690, 1643, 1538 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (d, 3H, J=6.6 Hz), 0.82 (d, 3H, J=6.5 Hz), 1.22-1.38 (m, 2H), 1.43-1.54 (m, 1H), 1.58-1.75 (m, 2H), 1.92-2.09 (m, 2H), 2.77-2.90 (m, 2H), 3.65 (s, 3H), 3.91-4.00 (m, 1H), 4.37-4.46 (m, 1H), 4.99 (d, 1 H, J=12.6 Hz), 5.04 (d, 1H, J=12.6 Hz), 5.18-5.25 (m, 1H), 5.79 (d, 1H, J=11.5 Hz), 5.92 (dd, 1H, J=11.5, 8.7 Hz), 6.72 (s, 1H), 7.14-7.36 (m, 1 1H), 7.43 (d, 1H, J=8.0 Hz), 7.76 (d, 1H, J=8.1 Hz), 8.01 (d, 1H, J=8.0 Hz); Anal. (C₃₁ H₄₀ N₄ O₇) C, H, N.

Example 6 Preparation of Compound 11: Methyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Preparation of Intermediate Methyl-3- BOC-L-(Tr-Gln)!-E-Propenoate

Sodium bis(trimethylsilyl)amide (0.978 mL of a 1.0M solution in THF, 0.978 mmol) was added to a solution of trimethyl phosphonoacetate (0.144 mL, 0.890 mmol) in THF (20 mL) at -78° C., and the resulting solution was stirred for 15 minutes at that temperature. BOC-L-(Tr-Glutaminal) (0.420 g, 0.889 mmol) in THF (10 mL) was added via cannula, and the reaction mixture was stirred for 2 hours at -78° C., then was partitioned between 0.5M HCl (100 1L) and a 1:1 mixture of EtOAc and hexanes (2×100 mL). The organic layers were dried over Na₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (gradient elution, 30-40% EtOAc in hexanes) provided methyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.460 g, 96%) as a white solid: mp 110°-112° C.; IR (thin film) 3318, 1708, 1665 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.42 (s, 9H), 1.72-1.82 (m, 1H), 1.91-1.98 (m, 1H), 2.34-2.41 (m, 2H), 3.72 (s, 3H), 4.29 (s, br, 1H), 4.78-4.81 (m, 1H), 5.89 (dd, 1H, J=15.6, 1.6 Hz), 6.80 (dd, 1H, J=15.6, 5.3 Hz), 6.87 (s, 1H), 7.19-7.33 (m, 15H).

Preparation of Intermediate Methyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 28 for the preparation of ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, methyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.157 g, 0.297 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.123 g, 0.298 mmol) to provide methyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.176 g, 72%) as a white foam: ¹ H NMR (CDCl₃) δ 0.84 (d, 3H, J=6.7 Hz), 0.86 (d, 3H, J=6.7 Hz), 1.45-1.61 (m, 3H), 1.67-1.75 (m, 1H), 1.94-1.96 (m, 1H), 2.20-2.35 (m, 2H), 2.95-3.15 (m, 2H), 3.72 (s, 3H), 3.94-4.01 (m, 1H), 4.46-4.49 (m, 1H), 4.83-4.93 (m, 3H), 5.72 (d, 1H, J=15.8 Hz), 6.45 (d, 1H, J=7.2 Hz), 6.63 (d, 1H, J=8.1 Hz), 6.71 (dd, 1H, J=15.8, 5.1 Hz), 7.01-7.38 (m, 27H).

Preparation of Product--Methyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, methyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.087 g, 0.106 mmol) was deprotected to provide methyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate (0.015 g, 25%) as a white solid: mp=220° C. (dec); ¹ H NMR (DMSO-d₆) δ 0.79 (d, 3H, J=10.9 Hz), 0.81 (d, 3H, J=10.9 Hz), 1.26-1.34 (m, 2H), 1.47-1.49 (m, 1H), 1.61-1.76 (m, 2H), 2.06 (t, 2H, J=7.6 Hz), 2.84 (dd, 1H, J=13.5, 9.0 Hz), 2.97 (dd, 1H, J=13.5, 5.6 Hz), 3.65 (s, 3H), 3.93-3.97 (m, 1H), 4.38 (s, br, 1H), 4.44-4.49 (m, J1), 4.97 (d, 1H, J=12.5 Hz), 5.04 (d, I H, J=12.5 Hz), 5.68 (d, 1 H, J=15.6 Hz), 6.70 (dd, I1H, J=15.6, 5.5 Hz), 6.76 (s, I1H), 7.19 (s, br, 7H), 7.34 (s, br, 4H), 7.44 (d, 11H, J=7.5 Hz), 7.99 (d, 1 H, J=8.1 Hz), 8.05 (d, 1H, J=8.1 Hz).

Example 7 Preparation of Compound 13: 4-(CBZ-L-Leu-L-Phe-L-Gln)-E-3-Butene-2-one

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(Tr-G1n)-N(Me)OMe

BOC-L-(Tr-Gln)-N(Me)OMe (0.807 g, 1.52 mmol) was dissolved in 1,4-dioxane (4.5 mL) at room temperature. A solution of HCl in 1,4-dioxane (4.0M, 4.5 mL) was added dropwise, and the reaction solution was stirred for 2.5 hours under an argon balloon. The solvent was evaporated to give the crude amine salt as a white foam, which was used without further purification. This amine salt, CBZ-L-Leu-L-Phe (0.626 g, 1.52 mmol) and 1-hydroxybenzotriazole hydrate (0.308 g, 2.28 mmol) were stirred in dry CH₂ Cl₂ (12 mL) under argon at room temperature. 4-Methylmorpholine (0.840 mL, 7.64 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.436 g, 2.27 mmol) were added sequentially. After stirring for 3 hours, the reaction solution was poured into water (25 mL), and the aqueous layer was extracted 3 times with CH₂ Cl₂ (70 mL, 40 mL, and 30 mL). The combined organic phases were dried over Na₂ SO₄ and concentrated. The residue was purified by flash column chromatography (40% acetone in hexanes) to give the product (0.826 g, 66%) as a white foam: IR (thin film) 3300, 1643, 1525 cm⁻¹.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(Tr-Glutaminal)

CBZ-L-Leu-L-Phe-L-(Tr-Gln)-N(Me)OMe (0.768 g, 0.930 mmol) was dissolved in dry THF (12 mL) under argon and cooled to -78° C. A solution of diisobutylaluminum hydride in toluene (1.5M, 2.17 mL, 3.26 mmol) was added dropwise. After stirring 3 hours, methanol (0.7 mL) was added slowly, followed by 1N HCl (1 mL). The reaction mixture was allowed to warm to nearly room temperature and was then diluted with 5:1 CH₂ Cl₂ /EtOAc (120 mL). The resulting mixture was washed with 1N HCl (2×15 mL), half-saturated NaHCO₃ (15 mL) and brine (25 mL). The organic phase was dried over MgSO₄ and concentrated to give the product as an off-white foam (0.606 g, 85%), which was used without further purification. An analytical sample was purified by column chromatography (36% acetone in hexanes): IR (thin film) 3295, 1708, 1660, 1531 cm⁻¹ ; ¹ H NMR (CDCl) δ 0.80 (d, 3H, J=6.2 Hz), 0.87 (d, 3H, J=6.4 Hz), 1.27-1.59 (m, 3M), 1.71-1.83 (m, 1H), 2.07-2.15 (m, 1H), 2.22-2.29 (m, 2H), 2.96 (dd, 1H, J=13.7, 7.4 Hz), 3.08 (dd, 1H, J=13.7, 6.2 Hz), 3.99-4.08 (m, 1H), 4.11-4.20 (m, 1H), 4.55-4.64 (m, 11), 4.92 (bs, 2H), 5.17 (d, 1H, J=6.7 Hz), 6.70 (d, 1H, J=7.4 Hz), 7.08-7.35 (m, 27H), 9.26 (s, 1H); Anal. (C₄₇ H₅₀ N₄ O₆) C, H, N.

Preparation of Intermediate 4- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-3-Butene-2-one

CBZ-L-Leu-L-Phe-L-(Tr-Glutaminal) (0.605 g, 0.789 mmol) and 1-triphenylphosphoranylidene-2-propanone (0.251 g, 0.788 mmol) were stirred in dry THF (7 mL) at room temperature, under argon, giving a yellow solution. After stirring 20 hours, the solvent was evaporated, and the residue was purified by flash column chromatography (36% acetone in hexanes) to give the product (0.425 g, 67%) as a white foam: IR (thin film) 3299, 1666, 1519 cm⁻¹.

Preparation of Product--4-(CBZ-L-Leu-L-Phe-L-Gln)-E-3-Butene-2-one

This compound was prepared in 54% yield from 4- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-3-butene-2-one using the procedure described in Example 26 for the preparation of compound 14, 3-(CBZ-L-Leu-L-Phe-DL-Gln)-E-propenonitrile: mp=194°-196° C. (dec); IR (KBr) 3413, 3284, 1684, 1643, 1537 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (d, 3H, J=6.6 Hz), 0.82 (d, 3H, J=6.6 Hz), 1.23-1.39 (m, 2H), 1.44-1.55 (m, 1H), 1.60-1.84 (m, 2H), 2.05-2.12 (m, 2H), 2.17 (s, 3H), 2.84 (dd, 1H, J=13.6, 8.7 Hz), 2.99 (dd, 1H, J=13.6, 5.7 Hz), 3.93-4.02 (m, 1H), 4.34-4.44 (m, 1H), 4.46-4.55 (m, 1H), 4.98 (d,1H, J=12.6 Hz), 5.04 (d, 1H, J=12.6 Hz), 5.84 (d,1H, J=16.0 Hz), 6.64 (dd,1H, J=16.0, 5.4 Hz), 6.77 (s, 1H), 7.15-7.37 (m, 1 1H), 7.43 (d, 1H, J=7.9 Hz), 7.99 (d, 1H, J=8.1 Hz), 8.06 (d, 1H, J=8.1 Hz); Anal. (C₃₁ H₄₀ N₄ O₆) C, H, N.

Example 8 Preparation of Compound 5: Ethyl-3- CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Ala!-E-Propenoate

Preparation of Intermediate CBZ-L- N-(4-Chlorobutyryl)-amino!-Ala-OMe

Acetyl chloride (19.6 g, 250 mmol) was slowly added to a solution of MeOH (300 mL) at 0° C. After 10 minutes, CBZ-L-amino-Ala (10 g., 42 mmol) was added, and the reaction was allowed to stir for 12 hours at room temperature. Removal of solvent under vacuum provided 13.5 g of crude CBZ-L-amino-Ala-OMe as the hydrochloride salt. The crude ester was taken up in 200 mL CH₂ Cl₂, to which was added Et₃ N (10.6 g, 105 mmol) and then 4-chlorobutyryl chloride (7.1 g, 50.4 mmol) at 0° C. The reaction was allowed to warm to room temperature and was stirred for 4 hours. At this time the reaction mixture was added to brine. The organic layer was extracted, washed with 1N HCl, brine, dried over MgSO₄, and concentrated yielding, 19 g of crude material. The material was purified by flash column chromatography (50% EtOAc-hexanes), giving an 87% yield of product. ¹ H NMR (CDCl₃) δ 2.07 (m, 2H), 2.35 (t, 2H, J=7.0 Hz), 3.57 (t, 2H, J=6.3 Hz), 3.67 (t, 2H, J=5.9 Hz), 3.77 (s, 3H), 4.45 (m, 1H), 5.12 (s, 2H), 5.84 (d, 1H, J=6.3 Hz), 6.00 (bs, 1H), 7.37 (s, 5H).

Preparation of Intermediate CBZ-L- N-(2-pyrrolidinone)!-Ala-OMe

A solution of CBZ-L- N-(4-chlorobutyryl)-amino!-Ala-OMe (14.6 g, 39 mmol) in DMF (400 mL) was cooled to 0° C. To the solution was added NaH (1.87 g of a 60% dispersion in oil, 46.8 mmol), and the mixture was stirred at room temperature for 4 hours. The DMF was removed under high vacuum, and the residue was taken up in EtOAc, washed with 1N HCl, saturated aqueous NaHCO₃, brine, dried over MgSO₄ and concentrated. The material was purified by flash column chromatography (100% EtOAc), giving 7.0 g (56%) of product. ¹ H NMR 6 (CDCl₃) 1.97 (m, 2H), 2.35 (m, 2H), 3.36 (m, 1H), 3.40-3.60 (m, 3H), 3.77 (s, 3H), 4.52 (m, 1H), 5.13 (d, 2H, J=5.6 Hz), 5.83 (d, 1H, J=6.3 Hz), 7.37 (m, 5H).

Preparation of Intermediate L- N-(2-pyrrolidinone)!-Ala-OMe-HCl

This compound was prepared from CBZ-L- N-(2-pyrrolidinone)!-Ala-OMe by catalytic hydrogenation as described in Example 2 for the preparation of L-(N-Ac-amino)alaninol, except methanolic HCl was used in order to isolate the product as the HCl salt. ¹ H NMR (CDCl₃), δ 2.03 (m, 2H), 2.39 (m, 2H), 3.14 (bs, 2H), 3.40-3.70 (m, 5H), 3.75 (s, 3H).

Preparation of Intermediate CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Ala-OMe

This compound was prepared from CBZ-L-Leu-L-Phe and L- N-(2-pyrrolidinone)!-Ala-OMe.HCl using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninol. ¹ H NMR (CDCl₃), δ 0.89 (m, 6H), 1.36 (m, 2H), 1.56 (m, 1H), 1.61 (m, 2H), 2.04 (m, 3H), 2.31 (m, 2H), 3.07-3.70 (m, 6H), 3.75 (s, 3H), 4.11 (m, 1H), 4.71 (m, 1H), 5.13 (bs, 1H), 5.18 (bs, 1H), 6.76-6.88 (m, rotomers, 1H), 7.10-7.45 (m, 10H).

Preparation of Intermediate CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Alaninol

This compound was prepared by the reduction of CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Ala-OMe with NaBH₄ and LiCl using the procedure described in Example 2 for the preparation of CBZ-L-(N-Ac-amino)-alaninol.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Alaninal

This compound was prepared from CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-alaninol using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide). Anal. (C₃₀ H₃₈ N₄ O₆.1.4 H₂ O) C, H, N.

Preparation of Product--Ethyl-3- CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-Ala!-E-Propenoate

This compound was prepared from CBZ-L-Leu-L-Phe-L- N-(2-pyrrolidinone)!-alaninal and (carbethoxymethylene)triphenylphosphorane using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate.¹ H NMR (DMSO-d₆) δ 0.80 (d, 6H, J=7.0 Hz), 0.95-1.40 (m, 7H), 1.49 (m, 1H), 1.82 (m, 2H), 2.12 (m, 2H), 2.60-3.10 (m, 2H), 3.20 (m, 2H), 3.81 (m, 1H), 4.00 (m, 1H), 4.10 (m, 2H), 4.49 (m, 1H), 4.72 (m, 1H), 5.01 (bs, 1H), 5.70 (d, 0.5H-rotomer-J=16.5 Hz), 5.97 (d, 0.5H-rotomer-J=16.5 Hz), 6.70 (d, 0.5H -rotomer-J=16.5 Hz), 6.80 (d, 0.5H-rotomer-J=16.5 Hz), 7.20 (d, 2H, J=7.4 Hz), 7.34 (m, 3H), 7.60 (m, 5H), 8.04 (m, 1H), 8.23 (m, 1H). HRMS calcd for C₃₄ H,4N₄ O₇ +Cs 753.2264 (M+Cs), found 753.2295.

Example 9 Preparation of Compound 16: Ethyl-3- CBZ-L-Leu-L-Phe-L-(-carbamyl-amino)-Ala!-E-Propenoate

Preparation of Intermediate CBZ-L-(N-BOC-amino)-Ala

To a stirred solution of NaOH (1.23 g, 30.76 mmol) in 36 mL of H₂ O and 24 mL tert-butanol was added CBZ-L-amino-Ala (7.15 g, 30 mmol). To this solution was added di-tert-butyl dicarbonate (6.88 g, 31.5 mmol). Stirring was continued at room temperature for 12 hours, at which time the solution was washed with pet. ether (2×150 mL). The organic layers were washed with saturated aqueous NaHCO₃ (3×20 mL), and the aqueous layers were combined and acidified at 0° C. with 25% aqueous KHSO₄ to pH 2-3. This milky white mixture was then extracted with a large excess of Et₂ O, dried over anhydrous Na₂ SO₄, and concentrated to yield 9.13 g (90%) of product as a white solid, which was used without further purification. ¹ H NMR (DMSO-d₆) δ 1.35 (s, 9H), 3.21 (m, 2H), 4.05 (m, 1H), 5.02 (s, 2H), 6.83 (bt, 1H, J=6.6 Hz), 7.34 (m, 5H), 7.41 (d, 1H, J=8.1 Hz), 12.65 (bs, 1H). This compound was further characterized as its corresponding methyl ester.

Preparation of Intermediate CBZ-L-(N-BOC-amino)-Ala-OMe.

A solution of diazomethane in Et₂ O, generated from N-methyl-N-nitroso-p-toluenesulfonamide (7.7 g, 36.0 mmol), 70 mL Et₂ O, 16 mL EtOH, 12 mL H₂ O and KOH (7.65 g, 13.6 mmol) was carefully distilled into a stirred solution of CBZ-L-(N-BOC-amino)-Ala (7.8 g, 23.0 mmol) in 50 mL Et₂ O and 10 mL EtOH at 0° C. The yellow solution was stirred for 30 minutes. The cold solution was then brought to room temperature, and argon was bubbled into the reaction flask to remove any excess diazomethane. After the solution turned colorless, it was concentrated to give the methyl ester as a white solid in quantitative yield. mp 72°-74° C.; IR (KBr) 3418, 3331, 3005, 2955, 1753, 1724, 1676, 1552, 1525, 1298, 1045, 699 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.41 (s, 9H), 3.55 (m, 2H), 3.76 (s, 3H), 4.40 (m, 2H), 4.82 (m, 1H), 5.11 (s, 2H), 5.77 (m, 1H), 7.35 (m, 5H). Anal. (C₁₇ H₂₄ N₂ O₆) C, H, N.

Preparation of Intermediate CBZ-L-(N-BOC-amino)-Alaninol

Using the borohydride reduction procedure described in Example 2 for the preparation of CBZ-L-(N-Ac-amino)-alaninol, CBZ-L-(N-BOC-amino)-Ala-OMe was converted to the corresponding alcohol and isolated in 96% yield without column chromatography purification. mp=116°-119° C.; IR (KBr) 3327, 3277, 3065, 2976, 1699, 1682, 1543, 1315, 1250, 1062, 1001, 696 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.35 (s, 9H), 2.90-3.10 (m, 4H), 3.55 (m 1H), 4.60 (bt, 1H, J=5.5 Hz), 4.99 (s, 2H), 6.72 (bt, 1H, J=5.5 Hz), 6.86 (d, 1H, J=8.1 Hz), 7.34 (m, 5H). Anal. (C₁₆ H₂₄ N₂ O₅) C, H, N.

Preparation of Intermediate L-N-BOC-amino)-Alaninol

Using the hydrogenation procedure described in Example 2 for the preparation of L-(N-Ac-amino)-alaninol, the CBZ group was removed from CBZ-L-(N-BOC-amino)-alaninol to give the amino alcohol in 98% yield. mp=61°-64° C.; IR (KBr) 3362, 2980, 2935, 1680, 1534, 1370, 1287, 1175, 1059, 642 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.36 (s, 9H), 2.64 (m, 1H), 2.72 (m, 1H), 2.93 (m, 1H), 3.13 (m, 1H), 3.32 (m, 2H), 4.45 (bs, 1H), 6.67 (bs, 1H); Anal. (C₈ H₁₈ N₂ O₃) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(N-BOC-amino)-Alaninol

This compound was prepared from L-(N-BOC-amino)-alaninol and CBZ-L-Leu-L-Phe using the coupling procedure described in Example 2 for the preparation of CBZ-L-Leu-L-Phe-L-(N-Ac-amino)-alaninol. The reaction mixture was purified by flash column chromatography (5% saturated anhydrous NH₃ in MeOH/CH₂ Cl₂) to give a white solid in 90% yield. IR (KBr) 3420, 3327, 3289, 3032, 2953, 1694, 1643, 1535, 1284, 1036, 696 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (dd, 6H, J=11.2, 6.4 Hz), 1.35 (s, 9H), 1.55 (m 2H), 1.72 (m, 1H), 2.89 (m, 2H), 3.19 (m, 2H), 3.78 (m, 1H), 3.92 (m, 1H), 4.44 (m, 1H), 4.62 (t, 1H, J=5.5 Hz), 5.01 (d, 2H, J=5.9 Hz), 6.63 (bt, 1H, J=5.5 Hz), 7.18 (m, 5H), 7.34 (m, 5H), 7.45 (d, 1H, J=8.1 Hz), 7.60 (d, 1H, J=7.7 Hz), 7.85 (d, 1H, J=8.1 Hz). Anal. (C₃₁ H₄₄ N₄ O₇) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(N-BOC-amino)-Alaninal

This compound was prepared in 90% yield as a white solid from CBZ-L-Leu-L-Phe-L-(N-BOC-amino)-alaninol using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide). The product was used immediately without further purification. The product existed as a mixture of aldehyde and aldehyde hydrate. IR (KBr) 3299, 3067, 2959, 2934, 1696, 1647, 1535, 1254, 1171, 747, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (dd, 6H, J=9.0, 6.8 Hz), 1.35 (s, 9H), 1.41 (m, 2H), 1.69 (m, 1H), 2.80-3.01 (m, 2H), 3.29 (m, 2H), 3.97 (m, 1H), 4.10 (m, 1H), 4.60 (m, 1H), 5.00 (s, 2H), 5.56 (d, J=7.4 Hz, hydrate), 6.78 (t, 1H, J=6.3 Hz), 7.20 (m, 5H), 7.33 (m, 5H), 7.40 (d, 1H, J=8.1 Hz), 7.97 (d, 1H, J=8.1 Hz), 8.39 (d, 1H, J=6.6 Hz), 9.26 (s, 1H); HRMS calcd for C₃₁ H₄₂ N₄ O₇ +Cs 715.2108 (M+Cs), found 715.2133. Anal. (C₃₁ H₄₂ N₄ O₇.0.5 H₂ O) C, H, N.

Preparation of Intermediate Ethyl-3- CBZ-L-Leu-L-Phe-L-N-BOC-amino)-Ala!-E-Propenoate

This compound was prepared in approximately 40% yield as a white foaming solid from CBZ-L-Leu-L-Phe-L-(N-BOC-amino)-alaninal and (carbethoxymethylene)-triphenylphosphorane using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate. The product was partially purified (impure with triphenylphosphine oxide as determined by NMR) by flash column chromatography (4% MeOH/CH₂ Cl₂). ¹ H NMR (DMSO-d₆) δ 0.80 (dd, 6H, J=9.6, 6.3 Hz), 1.19 (t, 3H, J=6.8 Hz), 1.34 (s, 9H), 1.45-1.70 (m, 3H), 2.82-3.05 (m, 4H), 3.99 (m, 1H), 4.08 (q, 2H, J=7.0 Hz), 4.46 (m, 2H), 5.01 (m, 2H), 5.64 (d, 1H, J=16.2 Hz), 6.61 (dd, 1H, J=16.2, 5.5 Hz), 6.85 (bt, 1H, J=5.2 Hz), 7.18 (m, 5H), 7.34 (m, 5H), 7.42 (d, 1H, J=5.5 Hz), 7.96 (d, 1H, J=7.4 Hz), 8.01 (d, 1H, J=7.4 Hz); HRMS calcd for C₃₅ H₄₈ N₄ O₈ +Na 675.3370 (M+Na), found 675.3363.

Preparation of Intermediate Ethyl-3-(CBZ-L-Leu-L-Phe-L-amino-Ala)-E-Propenoate

To a stirred solution of ethyl-3- CBZ-L-Leu-L-Phe-L-(N-BOC-amino)-Ala!-E-propenoate (0.14 g, 0.215 mmol) in 12 mL CH₂ Cl₂, cooled to 0° C., was added 0.65 mL TFA dropwise. The reaction was followed by TLC (silica, 10% MeOH/CH₂ Cl₂) until there was a disappearance of starting material. At this time the reaction mixture was taken up in 100 mL EtOAc and washed with saturated NaHCO₃ (3×10 mL). The organic layer was then washed with H₂ O then saturated brine and dried over anhydrous Na₂ SO₄. Concentration of the solution gave a residue, which was purified by flash column chromatography (8% MeOH/CH₂ Cl₂) to give a beige foam in 84% yield. ¹ H NMR (DMSO-d₆) δ 0.80 (dd, 6H, J=9.4, 6.8 Hz), 1.22 (t, 3H, J=7.2 Hz), 1.31 (m, 2H), 1.51 (m, 1H), 2.64 (m, 2H), 2.91 (m, 2H), 3.99 (m, 1H), 4.10 (q, 2H, J=7.4 Hz), 4.36 (m, 1H), 4.49 (m, 1H), 5.02 (m, 2H), 5.60 (d, 1H, J=16.2 Hz), 6.76 (dd, 1H, J=15.6, 5.0 Hz), 7.20 (m, 5H), 7.34 (m, 5H), 7.46 (d, 1H, J=7.0 Hz), 7.95 (d, 1H, J=8.5 Hz), 8.05 (d, 1H, J=5.9 Hz); MS calcd for C₃₅ H₄₈ N₄ O₈ +H 553 (M+H), found 553.

Preparation of Product--Ethyl-3- CBZ-L-Leu-L-Phe-L-N-carbamyl-amino)-Ala!-F-Propenoate

To a stirred solution of bis (4-nitrophenyl) carbonate (66 mg, 0.22 mmol) in 2 mL CH₂ Cl₂, was added a solution of ethyl-3- CBZ-L-Leu-L-Phe-L-amino-Ala!-E-propenoate (0.10 g, 0.18 mmol) in 2 mL CH₂ Cl₂. The mixture was stirred for 3 hours at which time 2 mL of saturated anhydrous methanolic ammonia was added. The yellow solution was allowed to stir for 30 minutes longer, diluted with 100 mL CH₂ Cl₂, and washed repeatedly with 1N NaOH to remove 4-nitrophenol. The organic layer was washed with dilute HCl, H₂ O, and brine, and dried over anhydrous Na₂ SO₄. This solution was concentrated, and the residue was subjected to flash column chromatography (5% MeOH/CH₂ Cl) to yield a white solid in 20% yield. IR (KBr) 3470, 3291, 2978, 2926, 1715, 1645, 1539, 1281, 1045, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.81 (dd, 6H, J=9.0, 6.8 Hz), 1.21 (t, 3H, J=7.0 Hz), 1.30 (m, 2H), 1.48 (m, 1H), 2.92 (m, 2H), 3.10 (m, 2H), 3.97 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.40 (m, 2H), 5.01 (m, 2H), 5.54 (bs, 2H), 5.61 (d, J=16.5 Hz), 6.04 (t, 1H, J=7.7 Hz), 6.71 (dd, J=15.8, 5.2 Hz), 7.20 (m, 5H), 7.34 (m, 5H), 7.46 (d, 1H, J=7.4 Hz), 8.01 (d, 1H, J=7.0 Hz), 8.11 (d, 1H, J=8.5 Hz); HRMS calcd for C₃₁ H₄₁ N₅ O₇ +Cs 728.2060 (M+Cs), found 728.2078 Anal. (C₃₁ H₄₁ N₅ O₇) C, H, N.

Example 10 Preparation of Compound 17: Isopropyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Preparation of Intermediate 3- BOC-L-(Tr-Gln)!-E-Propenoic Acid

Ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate (1.874 g, 3.46 mmol), prepared as decribed in Example 3, was taken up in 20 mL EtOH and treated with 1N NaOH solution (7.95 mL, 7.95 mmol) dropwise, via addition funnel, over 2 hours. The resulting solution was stirred at room temperature for 1.5 hours, whereupon the reaction mixture was poured into water and washed with ether. The aqueous layer was acidified to pH 3 with 1N HCl, and extracted 3 times with EtOAc. The organic phase was separated and dried over MgSO₄ and concentrated to provide 3- BOC-L-(Tr-Gln)!-E-propenoic acid (1.373 g, 77%) as an off-white foam. No further purification was needed: IR (thin film) 3315, 1698, 1666 cm⁻¹ ; ¹ H NMR(CDCl₃) δ 1.42 (s, 9H), 1.76 (m, 1H), 1.83-1.98 (m, 1H), 2.37 (t, 2H, J=7.0 Hz), 4.30 (m, 1H), 4.88 (m, 1H), 5.85 (d, 1H, J=15.3 Hz), 6.86 (dd, 1H, J=15.5, 5.1 Hz), 6.92 (s, 1H), 7.25 (m, 15H).

Preparation of Intermediate Isopropyl-3- BOC-L-(Tr-Gln)!-E-Propenoate

3-BOC-L-(Tr-Gln)!-E-Propenoic acid (0.500 g, 0.973 mmol), isopropanol (0.008 mL, 1.07 mmol), and 4-dimethylaminopyridine (0.012 g, 0.0973 mmol) were taken up in 10 mL dry CH₂ Cl, and treated with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.196 g, 1.07 mmol). The resulting solution was stirred at room temperature overnight, concentrated in vacuo, and purified by flash column with 50% EtOAc/hexanes to provide isopropyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0. 106 g, 20%) as a white foam: R_(f) =0.8 (50% EtOAc/hexanes); IR 3320, 1711 cm⁻¹ ; ¹ H NMR(CDCl₃) δ 1.25 (d, 6H, J=6.23 Hz), 1.43 (s, 9H), 1.72 (m, 1H), 1.96 (m, 1H), 2.37 (t, 2H, J=7.16 Hz), 4.30 (bs, 1H), 4.74 (m, 1H), 5.05 (m, 1H), 5.86 (dd, 1H, J=15.9, 5.0 Hz), 6.78 (dd, 1H, J=15.6, 5.0 Hz), 6.89 (1,s, 1H), 7.26 (m, 15H); Anal. (C₃₄ H₄₀ N₂ O₅) C, H, N.

Preparation of Intermediate Isopropyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Isopropyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.087 g, 0.191 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.079 g, 0.191 mmol) using the procedure described in Example 3 for the preparation of ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate, to provide the product (0.064 g, 40%) as a white foam: R_(f) =0.7 (50% EtOAc/hexanes); IR (thin film) 3283, 1707 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.86 (m, 6H), 1.03 (m, 1H), 1.23 (m, 6H), 1.72 (m, 1H), 1.96 (m, 1H), 2.28 (m, 2H), 2.54 (m, 1H), 2.70 (m, 1H), 2.78 (m, 1H), 2.95-3.25 (m, 4H), 3.99 (m, 1H), 4.85-5.13 (m, 4H), 5.66 (d, 1H, J=15.9 Hz), 6.45 (d, 1H, J=7.5 Hz), 6.55 (d, 1H, J=7.5 Hz), 6.68 (m, 1H), 7.12-7.36 (m, 25H); MS (M+Cs) 983.

Preparation of Product--Isopropyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate, isopropyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.059 g, 0.0694 mmol) was deprotected to provide the product (0.024 g, 57%) as a white solid: mp=180°-182° C.; R_(f) =0.6 (10% MeOH/CHCl₃); IR (KBr) 3272, 1705 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.70 (m, 1H), 0.80 (dd, 6H, J=10.6, 6.5 Hz), 1.21 (dd, 6H, J=6.2, 2.5 Hz), 1.32 (m, 1H), 1.70 (m, 1H), 2.05 (t, 2H, J=7.6 Hz), 2.83 (m, 1H), 2.97 (m, 1H), 3.99 (m, 1H), 4.37-4.49 (m, 4H), 4.91-5.06 (m, 4H), 5.60 (d, 1H, J=15.3 Hz), 6.67 (dd, 1H, J=15.6, 5.6 Hz), 6.76 (bs, 1H), 7.19 (m, 5H), 7.34 (m, 5H), 7.44 (d, 1H, J=7.2 Hz), 8.01 (m, 2H); Anal. (C₃₃ H₄₄ N₄ O₇.1.0 CH₂ Cl₂) C, H, N.

Example 11 Preparation of Compound 18: Cyclopentyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Preparation of Intermediate Cyclopentyl-3- BOC-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 10 for the preparation of isopropyl-3- BOC-L-(Tr-Gln)!-E-propenoate, 3- BOC-L-(Tr-Gln)!-E-propenoic acid (0.50 g, 0.973 mmol) was coupled with cyclopentanol (0.1 mL, 1.07 mmol) to provide cyclopentyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.123 g, 22%) as a white foam: R_(f) =0.7 (EtOAc/hexanes); IR (thin film) 3319, 1708 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.27 (m, 2H), 1.44 (s, 9H), 1.59-1.89 (m, 8H), 2.38 (t, 2H, J=7.2 Hz), 4.32 (bs, 1H), 4.55 (m, 1H), 5.22 (m, 1H), 5.87 (d, 1H, J=15.6 Hz), 6.77 (dd, 1H, J=15.1, 4.1 Hz), 6.90 (bs, 1H), 7.20-7.33 (m, 15H).

Preparation of Intermediate Cyclopentyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, cyclopentyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.077 g, 0.160 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.068 g, 0.160 mmol) to provide cyclopentyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.052 g, 36%) as a white foam: R_(f) =0.4 (50% EtOAc/hexanes); IR (thin film) 3401, 3319, 1708 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (m, 6H), 1.05 (m, 1H), 1.28 (m, 1H), 1.46-1.71 (m, 9H), 1.85 (m, 1H), 2.28 (m, 2H), 2.98-3.12 (m, 4H), 3.99 (m 1H), 4.47 (m, 2H), 4.83-5.21 (m, 4H), 5.65 (d 1H, J=15.9 Hz), 6.50 (d, 1H, J=7.2 Hz), 6.59 (d, 1H, J=8.1 Hz), 6.65 (dd, 1H, J=15.9, 5.4 Hz), 7.04-7.35 (m 25H); MS (M+Cs) 1009.

Preparation of Product--Cyclopentyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate, cyclopentyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.052 g, 0.059 mmol) was deprotected to provide the product (0.014 g, 36%) as a white solid: mp=182°-185° C.; R_(f) =0.5 (10% MeOH/CHCl,); IR (thin film) 3389, 3295, 1707 cm⁻¹ ; ¹ H NMR (Acetone-d₆) δ 0.85 (dd, 6H, J=10.6, 6.5 Hz), 1.08 (m, 1H), 1.48 (m, 1H), 1.60-1.70 (m, 11H), 1.89 (m, 1H), 2.22 (m, 2H), 2.96 (m, 1H), 3.18 (dd, 1H, J=13.9, 5.8 Hz), 4.00 (d, 1H, J=6.8 Hz), 4.08 (m, 1H), 4.59 (m, 2H), 4.97-5.16 (m, 4H), 5.76 (d, 1H, J=15.3 Hz), 6.71 (m, 2H), 7.15-7.41 (m, 10H), 7.51 (d, 1H, J=7.8 Hz); HRMS calcd for C₃₅ H₄₆ N₇ O₇ +Cs 767.2421 (M+Cs) found 767.2435.

Example 12 Preparation of Compound 19: Cyclopentylmethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Preparation of Intermediate Cyclopentylmethyl-3- BOC-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 10 for the preparation of isopropyl-3- BOC-L-(Tr-Gln)!-E-propenoate, 3- BOC-L-(Tr-Gln)!-E-propenoic acid (0.50 g, 0.973 mmol) was coupled with cyclopentylmethanol (0.12 mL, 1.07 mmol) to provide this ester (0.298 g, 51%) as a pale yellow oil: R_(f) =0.7 (50% EtOAc/hexanes); IR (thin film) 3336, 1707 cm⁻⁴ ; ¹ H NMR (CDCl₃) δ 1.28 (m, 2H), 1.43 (s, 9H), 1.54-1.62 (m, 5H), 1.72-1.78 (m, 4H), 2.37 (t, 2H, J=7.2 Hz), 4.01 (d, 2H, J=7.2 Hz), 4.31 (bs, 1H), 4.78 (m, 1H), 5.90 (dd, 1H, J=15.9, 1.6 Hz), 6.80 (dd, 1H, J=15.9, 5.3 Hz), 6.90 (bs, 1H), 7.19-7.34 (m, 15H); Anal (C₃₇ H₄₄ N₂ O₅) C, H, N.

Preparation of Intermediate Cyclopentylmethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, cyclopentylmethyl-3- B OC-L-(Tr-Gln)!-E-propenoate (0.150 g, 0.310 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.128 g, 0.310 mmol) to provide the product (0.062 g, 22%) as an off-white foam: R_(f) =0.4 (50% EtOAc/hexanes); IR (thin film) 3413, 3295, 1708 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (m, 6H), 1.05 (m, 1H), 1.46-1.65 (m, 10H), 1.74 (m, 1H), 2.25 (m, 2H), 2.93-3.11 (m, C 4H), 3.93-4.02 (m, 3H), 4.20 (m, 1H), 4.48 (m, 1H), 4.86-5.11 (m, 4H), 5.70 (d, 1H, J=15.0 Hz), 6.46 (d, 1H, J=6.9 Hz), 6.54 (d, 1H, J=8.4 Hz), 6.70 (m, 1H), 6.78 (m, 1H), 7.14-7.36 (m, 25H); MS (M+Cs) 1023.

Preparation of Product--Cyclopentylmethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate, cyclopentylmethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.062 g, 0.070 mmol) was deprotected to provide compound 11 (0.021 g, 47%) as a white solid: mp=145°-148° C.; R_(f) =0.4 (10% MeOH/CHCl₃); IR (thin film) 3401, 3295, 1713 cm⁻¹ ; ¹ H NMR (acetone-d₆) δ 0.86 (dd, 6H, J=10.6, 6.5 Hz), 1.09 (m, 1H), 1.20-1.85 (m, 13H), 2.21 (m, 2H), 2.99 (m, 1H), 3.18 (m, 1H), 3.99 (m, 2H), 4.10 (m, 2H), 4.59 (m, 2H), 4.98-5.16 (m, 4H), 5.83 (d, 1H, J=14.6 Hz), 6.67-6.98 (m, 2H), 7.20-7.45 (m, 10H), 7.55 (m, 1H); HRMS calcd for C₃₆ H₄₈ N₇ O₇ +Cs 781.2577 (M+Cs) found 781.2559.

Example 13 Preparation of Compound 21: 1-Pyrrolidin-1-yl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenone

Preparation of Intermediate 1-Pyrrolidin-1-yl-3- BOC-L-(Tr-Gln)!-E-Propenone

3- BOC-L-(Tr-Gln)!-E-Propenoic acid (1.09 g, 2.12 mmol) was coupled with pyrrolidine (0.18 mL, 2.12 mmol) by dissolving both in 30 1L dry CH₂ Cl₂ and treating with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.610 g, 3.18 mmol), 1-hydroxybenzotriazole hydrate (0.430 g, 3.18 mmol), Et₃ N (1.18 mL, 8.48 mmol) and stirring at room temperature overnight. The reaction mixture was poured into 50 mL 1N HCl, and the layers were separated. The organic layer was washed with 1N HCl and then a saturated NaHCO₃ solution. The organic layer was dried over MgSO₄ and concentrated to give a yellow residue, which was then subjected to column chromatography using a 5% MeOH/CHCl₃ to yield the product (0.661 g, 55%) as a white foam: R_(f) =0.5 (5% MeOH/CHCl₃); IR (thin film) 3291, 1696 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.42 (s, 9H), 1.89 (m, 6H), 2.37 (m, 2H), 3.44-3.53 (m, 4H), 4.28 (bs, 1H), 4.82 (d, 1H, J=7.8 Hz), 6.17 (dd, 1H, J=15.3, 1.6 Hz), 6.71 (dd, 1H, J=15.4, 6.1 Hz), 6.93 (bs, 1H), 7.19-7.32 (m, 15H); Anal (C₃₅ H₄₁ N₃ O₄ CH₂ Cl₂) C, H, N.

Preparation of Intermediate 1-Pyrrolidin-1-yl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenone

Using the procedure described in Example 3 for the preparation of compound 2, ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, 1-pyrrolidin-1-yl-3- BOC-L-(Tr-Gln)!-E-propenone (0.613 g, 1.166 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.481 g, 1.166 mmol), yielding 1-pyrrolidin-1-yl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenone (0.668 g, 67%) as a white foam: R_(f) =0.5 (10% MeOH/CHCl₃); IR (thin film) 3294, 1702 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (m, 6H), 1.31 (m, 1H), 1.46 (m, 1H), 1.81-1.94 (m, 6H), 2.28 (m, 2H), 2.96 (m, 1H), 3.15 (m, 1H), 3.39-3.50 (m, 4H), 3.95 (m, 2H), 4.87-5.11 (m, 4H), 6.14 (d, 1H, J=15.3 Hz), 6.45 (d, 1H, J=7.8 Hz), 6.67 (dd, 1H, J=14.8, 4.8 Hz), 6.82 (d, 1H, J=8.1 Hz), 7.08-7.33 (m, 25H), 7.44 (d, 1H, J=8.1 Hz); MS (M+H) 862.

Preparation of Product--1-Pyrrolidin-1-yl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenone

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate, l-pyrrolidin-1-yl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenone (0.668 g, 0.776 mmol) was deprotected to provide this final product (0.320 g, 67%) as a white solid: mp=195°-196° C. (dec); R_(f) =0.4 (10% MeOH/CHCl₃); IR (thin film) 3289, 1684 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (dd, 6H, J=12.1, 6.5 Hz), 1.29 (m, 1H), 1.47 (m, 1H), 1.68-1.87 (m, 6H), 2.05 (m, 2H), 2.84 (m, 1H), 3.01 (m, 1H), 3.29-3.40 (m, 4H), 3.94 (m, 1H), 4.44 (m, 2H), 5.01 (m, 2H), 6.14 (d, 1H, J=14.9 Hz), 6.507 (dd, 1H, J=15.4, 5.8 Hz), 6.76 (bs, 11H), 7.14-7.35 (m, 10H), 7.46 (d, 1H, J=7.8 Hz), 7.95-8.02 (m, 2H); HRMS calcd for C₃₄ H₄₅ N₅ O₆ 620.3448 (M+H), found 620.3437; Anal. (C₃₄ H₄₅ N₅ O₆.0.2 CH₂ Cl₂) C, H, N.

Example 14 Preparation of Compound 22: N,N-Dimethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenamide

Preparation of Intermediate N,N-Dimethyl-3- BOC-L-(Tr-Gln)!-E-Propenamide

Using the procedure described in Example 13 for the preparation of 1-pyrrolidin-1-yl-3- BOC-L-(Tr-Gln)!-E-propenone, 3- BOC-L-(Tr-Gln)!-E-propenoic acid (1.05 g, 2.04 mmol) was coupled with N,N-dimethylamine (0.167 g, 2.04 mmol) to provide the amide (0.848 g, 77%) as a white foam: R_(f) =0.6 (10% MeOH/CHCl₃); IR (thin film) 3297, 1690 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.42 (s, 9H), 1.81 (m, 1H), 1.93 (m, 1H), 2.38 (m, 2H), 2.98 (s, 3H), 3.03 (s, 3H), 4.27 (bs, 1H), 4.84 (d, 1H, J=7.2 Hz), 6.31 (dd, 1H, J=15.1, 1.4 Hz), 6.65 (dd, 1H, J=15.3, 5.9 Hz), 6.94 (bs, 1H), 7.19-7.33 (m, 15H); Anal (C₃₃ H₃₉ N₃ O₄.0.9 CH₂ Cl₂) C, H, N.

Preparation of Intermediate N,N-Dimethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenamide

Using the procedure described in Example 3 for the preparation of compound 2, ethyl-3-L CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, N,N-dimethyl-3- B OC-L-(Tr-Gln)!-E-propenamide (0.726 g, 1.567 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.646 g, 1.567 mmol) to provide the product (0.417 g, 32%) as a white foam: R_(f) =0.5 (10% MeOH/CHCl₃); IR (thin film) 3291, 1702 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (m, 6H), 1.30 (m, 1H), 1.47 (m, 1H), 1.74 (m, 1H), 1.94 (m, 3H), 2.56 (s, 3H), 2.96 (m, 1H), 3.15 (m, 1H), 2.99 (d, 6H, J=13.4 Hz), 3.94 (m, 1H), 4.54 (m, 2H), 4.87 (s, 2H), 5.00 (d, 2H, J=5.3 Hz), 6.28 (d, 1H, J=14.9 Hz), 6.42 (d, 1H, J=7.8 Hz), 6.63 (dd, 1H, J=15.3, 5.0 Hz), 6.81 (d, 1H, J=8.4 Hz), 7.06 (bs 1H), 7.10-7.36 (m, 25H); Anal (C₅₁ H₅₇ N₅ O₆.3.0 H₂ O) C, H, N.

Preparation of Product--N,N-Dimethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenamide

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenoate, N,N-dimethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenamide (0.417 g, 0.5 mmol) was deprotected to provide N,N-dimethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-propenamide (0.214 g, 72%) as a white solid: mp=174°-175° C. (dec); R_(f) =0.34 (MeOH/CHCl₃); IR (thin film) 3284, 1684 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (dd, 6H, J=12.1, 6.5 Hz), 1.30 (m, 1H), 1.47 (m, 1H), 1.70 (m, 2H), 2.06 (m, 2H), 2.84 (m, 1H), 2.98 (s, 3H), 3.03 (s, 3H), 3.94 (m, 1H), 4.44 (m, 2H), 4.95-5.07 (m, 4H), 6.27 (d, 1H, J=15.3 Hz), 6.47 (dd, 1H, J=15.3, 5.6 Hz), 6.75 (bs, 1H), 7.14-7.35 (m, 1 OH), 7.46 (d, 1H, J=7.5 Hz) 7.96-8.01 (m, 2H); HRMS calcd for C₃₂ H₄₃ N₅ O₆ 594.3291 (M+H), found 594.3281. Anal. (C₃₂ H₄₃ N₅ O₆.1.0 CH₂ Cl₂) C, H, N.

Example 15 Preparation of Compound 24: 1-Phenyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenone

Preparation of Intermediate 2-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)! -E-Vinyl) Pyridine

2-Picolyltriphenylphosphonium chloride/NaNH₂ (0.345 g, 0.76 mmol) was dissolved in 10 mL of THF. CBZ-L-Leu-L-Phe-L-(Tr-Glutaminal) (0.53 g, 0.69 mmol) was dissolved in 5 mL of THF and added dropwise to the yield solution at room temperature, which was allowed to stir overnight. The solvent was removed in vacuo, and the crude product purified by column chromatography eluting with a gradient of 1-5% MeOH in CHCl₃ to give 0.353 g (61%) of a white glassy solid: IR (KBr) 3295, 3061, 2953, 1952, 1881, 1649, 1539, 1234, 1045, 972, 750, 696 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (t, 6H, J=7.0 Hz), 1.30 (m, 2H), 1.46 (m, 1H), 1.70 (m, 2H), 2.27 (m, 2H), 2.78 (m, 1H), 3.03 (m, 1H), 3.97 (m, 1H), 4.42 (m,1H), 4.52 (m,1H), 4.96 (d, 1H, J=12.0 Hz), 5.03 (d, 1H, J=12.0 Hz), 6.38 (d, 1H, J=16.0 Hz), 6.60 (dd, 1H, J=16.0, 6.0 Hz), 7.10-7.34 (m, 27H), 7.42 (d, 1H, J=8.0 Hz), 7.73 (t, 1H, J=7.5 Hz), 7.92 (d, 1H, J=8.5 Hz), 8.07 (d, 1H, J=8.5 Hz), 8.49 (d, 1H, J=5.0 Hz), 8.59 (s, 1H); MS (M+H) 842. Anal. (C₅₃ H₅₅ N₅ O₅.0.75 H₂ O) C, H, N.

Preparation of Intermediate 2- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Pyridine

Using the procedure described in Example 32 for the preparation of compound 20, diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-vinyl! phosphonate, 2- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-vinyl! pyridine was synthesized from 2-(CBZ-L-Leu-L-Phe-L-Tr-Gln)-E-vinyl pyridine in 69% yield as a white solid: IR (KBr) 3291, 3059, 2955, 2359, 1694, 1641, 1539, 1234, 1119, 1047, 970, 743, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (m, 6H), 1.32 (m, 2H), 1.49 (m, 1H), 1.77 (m, 2H), 2.11 (t, 2H, J=7.0 Hz), 2.86 (m, 1H), 3.01 (m, 1H), 3.96 (m, 1H), 4.41 (m, 1H), 4.51 (m, 1H), 4.98 (d, 1H, J=13.0 Hz), 5.04 (d, 1H, J=13.0 Hz), 6.39 (d, 1H, J=16.0 Hz), 6.60 (dd, 1H, J=16.0, 6.0 Hz), 6.75 (bs, 1H), 7.08-7.34 (m, 13H), 7.45 (d, 1H, J=8.0 Hz), 7.73 (dt, 1H, J=7.5, 1.5 Hz), 7.97 (d, 1H, J=8.0 Hz), 8.07 (d, 1 H, J=8.0 Hz), 8.50 (d, 1H, J=4.0 Hz); HRMS calcd for C₃₄ H₄,N5O, 600.3186 (M+H), found 600.3198. Anal. (C₃₄ H₄₁ N₅ O₅.1.0 H₂ O) C, H, N.

Preparation of Intermediate 1-Phenyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenone

Using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate, this compound was synthesized from CBZ-L-Leu-L-Phe-L-Tr-glutaminal and (benzoylmethylene)triphenylphosphorane to give 0.38 g of crude material (impure with triphenylphosphine oxide), which was used without further purification.

Preparation of Product--1-Phenyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenone

To 0.38 g of 1-phenyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenone, impure with triphenylphosphine oxide, was added 10 mL of CH₂ Cl₂. TFA (1 mL) was added to this solution, and the reaction was stirred at room temperature for four hours. The reaction was poured into an EtOAc/saturated NaHCO, solution and agitated until white solids began to precipitate out of the organic layer. The aqueous layer was separated, and the solids filtered and washed with EtOAc to give compound 14 (0.0795 g, 20% yield from the aldehyde; 2 steps) as a white solid: IR (KBr) 3408, 3293, 3063, 2955, 1653, 1539, 1449, 1283, 1234, 1121, 1047, 970, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (m, 6H), 1.31 (m, 2H), 1.45 (m, 1H), 1.76 (m, 2H), 2.11 (t, 2H, J=8.0 Hz), 2.89 (m, 1H), 3.01 (m, 1H), 3.97 (m, 1H), 4.51 (m, 2H), 4.97 (d, 1H, J=13.0 Hz), 5.05 (d, 1H, J=13.0 Hz), 6.76 (dd, 1H, J=15.0, 5.0 Hz), 6.77 (bs, 1H), 6.91 (d, 1H, J=15.0 Hz), 7.02-7.34 (m, 11H), 7.47 (d, 1H, J=7.0 Hz), 7.54 (m, 2H), 7.66 (t, 1H, J=7.0 Hz), 7.93 (d, 2H, J=7.0 Hz), 8.04 (d, 1H, J=8.0 Hz), 8.10 (d, 1H, J=8.5 Hz); HRMS calcd for C₃,H₄₃ N₄ O₆ 627.3182 (M+H), found 627.3199. Anal. (C₃₆ H₄₃ N₄ O₆) C, H, N.

Example 16 Preparation of Compound 26: Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-Gln!-E-Propenoate

Preparation of Intermediate BOC-L-(4-Cl-Phe)-L-(Tr-Glutaminol)

BOC-L4-Cl-Phe (0.90 g, 3.0 mmol) was dissolved in 30 mL of THF. Carbonyldiimidazole (0.49 g, 3.0 mmol) was added, and the reaction was allowed to stir at room temperature for one hour. L-(Tr-Glutaminol) (1.12 g, 3 mmol) was added, and the reaction was stirred overnight at room temperature. The solvent was removed in vacuo, and the product was purified by flash column chromatography eluting with 3% MeOH/CHCl₃ to yield 1.57 g (80%) of a white solid: IR (KBr) 3416, 3302, 3057, 3024, 2978, 2934, 1663, 1491, 1447, 1366, 1250, 1165, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.28 (s, 9H), 1.44 (m, 1H), 1.66 (m, 1H), 2.26 (m, 2H), 2.72 (m, 1H), 2.91 (m, 1H), 3.18 (m, 2H), 3.64 (m, 1H), 4.07 (m, 1H), 4.67 (t, 1H, J=5.0 Hz), 7.05-7.32 (m, 19H), 6.86 (d, 1H, J=8.5 Hz), 7.62 (d, 1H, J=8.5 Hz), 8.48 (s, 1H). Anal. (C₃₈ H₄₂ N₃ O₅ Cl.1.0 H₂ O) C, H, N.

Preparation of Intermediate L-(4-Cl-Phe)-L-(Tr-Glutaminol) Hydrochloride Salt

BOC-L-(4-Cl-Phe)-L-(Tr-Glutaminol) (1.57 g., 2.4 mmol) was dissolved in a minimum amount of CH₂ Cl₂ (˜5 mL) followed by 50 mL of Et₂ O. Anhydrous HCl gas was bubbled into the solution until a white solid precipitated from solution. The reaction was allowed to stir at room temperature overnight, and the resulting solid was filtered and washed with Et₂ O, giving 1.19 g (84%) of a white crystalline material: IR (KBr) 3246, 3057, 3028, 2934, 1668, 1494, 1447, 1089, 700cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.48 (m, 1H), 1.71 (m, 1H), 2.30 (m, 2H), 2.94-3.17 (m. 3H), 3.27 (m, 1H), 3.67 (br, 2H), 3.98 (m, 1H), 7.07-7.40 (m, 19H), 8.28 (bs, 3H), 8.34 (d, 1H, J=8.8 Hz), 8.54 (s, 1H). Anal. (C₃₃ H₃₄ N₃ O₃ Cl.1.0HCl.0.75 H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-(Tr-Glutaminol)

4-Methoxyindole-2-carboxylic acid (0.36 g, 1.87 mmol) was suspended in 10 mL of CH₂ Cl₂. To this suspension was added N-hydroxysuccinimide (0.23 g, 1.97 mmol) and 2 mL of DMF to dissolve all solids. Dicyclohexylcarbodiimide (0.41 g, 1.97 mmol) was added, and the reaction mixture was stirred at room temperature for 4 hours. At this time the mixture was then filtered into a separate flask containing (1.17 g, 1.97 mmol) of L-(4-Cl-Phe)-L-(Tr-glutaminol)-HCl salt, 0.41 mL (2.95 mmol) of Et₃ N, 10 mL of CH₂ Cl₂, and 2 mL of DMF, removing the N,N'-dicyclohexylurea precipitate. The reaction was allowed to stir overnight at room temperature. The solvents were removed in vacuo, and the resulting crude product was purified by flash column chromatography eluting with 3% (anhydrous NH₃ /MeOH)/CHCl₃ to afford 0.53 g (39%) of a white solid: IR (KBr) 3290, 3057, 2933, 1653, 1491, 1360, 1257, 1098, 754, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.50 (m, 1H), 1.74 (m, 1H), 2.28 (m 2H), 3.02 (m, 2H), 3.24 (m, 2H), 3.66 (m, 1H), 3.87 (s, 3H), 4.65 (m, 1H), 4.70 (m, 1H), 6.49 (m, 1H, J=7.3 Hz), 6.94-7.38 (m, 22H), 7.86 (d, 1H, J=8.8 Hz), 8.49 (d, 1H, J=8.8 Hz), 8.53 (s, 1H), 11.50 (s, 1H). Anal. (C₄₃ H₄₁ N₄ O₅ Cl.0.75 H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-(Tr-Glutaminal)

N-(4-Methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminol) (1.13 g, 1.55 mmol) was dissolved in 15 mL of DMSO. o-Iodoxybenzoic acid (1.30 g, 4.66 mmol) was added to this solution, and dissolved after a few minutes of stirring at room temperature. After two hours the DMSO was removed under reduced pressure. The residue was twice diluted with CH₂ Cl₂, and the solvent was evaporated to remove any residual DMSO. The residue was diluted with EtOAc, and the white precipitate was triturated and filtered off. The organic solvent was washed with 10% Na₂ S₂ O₃ /10% NaHCO₃ solution, water, and brine before drying over Na₂ SO₄. The solvent was removed to give 0.85 g (76%) of a white glassy solid which was used immediately without further purification: ¹ H NMR (DMSO-d₆) δ 1.72 (m, 2H), 2.32 (m, 2H), 3.04 (m, 1H), 3.11 (m, 11H), 3.87 (m, 311), 4.05 (m, 1H), 4.81 (m, 1H), 6.49 (d, 1H, J=7.3 Hz), 6.94-7.39 (m, 22H), 8.60 (m, 2H), 8.63 (s, 1H), 9.34 (s, 1H), 11.48 (s, 1H).

Preparation of Intermediate Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate, this compound was synthesized from N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminal) in 59% yield as a white solid: IR (KBr) 3302, 3057, 2934, 1958, 1896, 1659, 1491, 1260, 1096, 1036, 833, 756, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.22 (t, 3H, J=6.0 Hz), 1.72 (m, 2H), 2.24 (m, 2H), 3.05 (m, 2H), 3.88 (s, 3H), 4.12 (q, 2H, J=6.0 Hz),4.43 (m, 1H), 4.78 (m, 1H), 5.74 (d, 1H, J=14.0 Hz), 6.50 (d, 1H, J=7.7 Hz), 6.77 (dd, 1H, J=16.0, 5.0 Hz), 6.93-7.57 (m, 22H), 8.33 (d, 1H, J=7.7 Hz), 8.56 (d, 1H, J=7.7 Hz), 8.60 (s, 1H), 11.51 (s, 1H). Anal. (C₄₇ H₄₅ N₄ O₆ Cl.0.5 H₂ O) C, H, N.

Preparation of Product--Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-Gln!-E-Propenoate

Using the procedure described in Example 32 for the preparation of compound 20, diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-vinyl! phosphonate, this compound was synthesized by deprotection of ethyl-3- N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-Gln)!-E-propenoate. The product was purified by flash silica gel chromatography eluting with 2-3% MeOH/CHCl₃ to give 0.16 g (73%) of an off-yellow solid: IR (KBr) 3420, 3289, 2930, 2838, 1722, 1663, 1622, 1541, 1261, 1184, 1101, 976, 754 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.21 (t, 3H, J=7.0 Hz), 1.74 (m, 2H), 2.11 (t, 2H, J=8.0 Hz), 3.02 (m, 2H), 3.88 (s, 3H), 4.12 (q, 2H, J=7.0 Hz), 4.42 (m, 1H), 4.68 (m, 1H), 5.74 (dd, 1H, J=16.0, 1.5 Hz), 6.47 (d, 1H, J=5.0 Hz), 6.75 (bs, 1H), 6.76-6.81 (m, 2H), 6.96 (d, 1H, J=8.5 Hz), 7.07 (t, 1H, J=8.0 Hz), 7.24-7.38 (m, 5H), 8.33 (d, 1H, J=8.0Hz), 8.58 (d, 1H, J=8.5 Hz), 11.52 (s, 1H); HRMS calcd for C₂₈ H₃₁ N₄ O₆ Cl+Cs 687.0986 (M+Cs), found 687.0976. Anal. (C₂₈ H₃₁ N₄ O₆ Cl) C, H, N.

Example 17--Preparation of Compound 27: Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-F-Phe)-L-Gln!-E-Propenoate Preparation of Intermediate BOC-L-(4-F-Phe)-L-(Tr-Glutaminol)

Using the procedure described in Example 16 for the preparation of BOC-L-(4-Cl-Phe)-L-(Tr-glutaminol), this compound was synthesized from BOC-L-4-F-Phe and L-(Tr-glutaminol) in 80% yield. White solid: IR (KBr) 3416, 3308, 3057, 2978, 2932, 1663, 1510, 1368, 1223, 1167, 1051, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.28 (s, 9H), 1.44 (m, 1H), 1.68 (m, 1H), 2.25 (m, 2H), 2.70 (m, 1H), 2.90 (m, 1H), 3.25 (m, 2H), 3.63 (m, 1H), 4.10 (m, 1H), 4.67 (t, 1H, J=5.0 Hz), 7.04-7.28 (m, 19H), 6.85 (d, 1H, J=8.5 Hz), 7.61 (d, 1H, J=8.0 Hz), 8.48 (s, 1H). Anal. (C₃₈ H₄₂ N₃ O₅ F 0.75 H₂ O) C, H, N.

Preparation of Intermediate L-(4-F-Phe)-L-(Tr-Glutaminol) Hydrochloride Salt

Using the procedure described in Example 16 for the preparation of L-(4-Cl-Phe)-L-(Tr-glutaminol) hydrochloride salt, this salt was synthesized from BOC-L-(4-F-Phe)-L-(Tr-glutaminol) in 79% yield. White crystalline solid: IR (KBr) 3245, 3057, 2361, 1668, 1510, 1447, 1223, 766, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.47 (m, 1H), 1.72 (m, 1H), 2.30 (m, 2H), 2.94-3.16 (m, 3H), 3.23 (m, 1H), 3.65 (bs, 2H), 3.95 (m, 1H), 7.09-7.32 (m, 19H), 8.28 (m, 4H), 8.54 (s, 1H). Anal. (C₃₃ H₃₄ N₃ O₃ F1.0HCl 1.0 H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(4-F-Phe)-L-(Tr-Glutaminol)

Using the procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminol), this intermediate was synthesized from 4-methoxyindole-2-carboxylic acid and L-(4-F-Phe)-L-(Tr-glutaminol) HCl salt, in 40% yield. White solid: IR (KBr) 3314, 3059,2938, 1956, 1888, 1653, 1510, 1361, 1255, 1097, 835, 756, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.58 (m, 1H), 1.81 (m, 1H), 2.28 (m, 2H), 3.02 (m, 2H), 3.23 (m, 2H), 3.67 (m, 1H), 3.87 (s, 3H), 4.69 (m, 2H), 6.49 (m, 1H, J=7.3 Hz), 6.94-7.39 (m, 22H), 7.84 (d, 1H, J=8.5 Hz), 8.48 (d, 1H, J=8.5 Hz), 8.53 (s, 1H), 11.49 (s, 1H). Anal. (C₄₃ H₄₁ N₄ O₅ F 1.0H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(4-F-Phe)-L-(Tr-Glutaminal)

Using the oxidation procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminal), this aldehyde was prepared in 80% yield from N-(4-methoxyindole-2-carbonyl)-L-(4-F-Phe)-L-(Tr-glutaminol). Glassy white solid: ¹ H NMR (DMSO-d₆) δ 1.72 (m, 2H), 2.37 (m, 2H), 3.03 (m, 1H), 3.17 (m, 1H), 3.87 (s, 3H), 4.09 (m, 1H), 4.74 (m, 1H), 6.49 (d, 1H, J=7.7 Hz), 6.94-7.41 (m, 22H), 8.58 (m, 2H), 8.63 (s, 1H), 9.32 (s, 1H), 11.49 (s, 1H).

Preparation of Intermediate Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-F-Phe)-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate, this vinyl ester was synthesized from N-(4-methoxyindole-2-carbonyl)-L-(4-F-Phe)-L-(Tr-glutaminal) and (carbethoxymethylene)triphenyl-phosphorane in 60% yield. White solid: IR (KBr) 3300, 3061, 2938, 1958, 1890, 1653, 1510, 1368, 1260, 1100, 1036, 835, 756, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.20 (t, 3H, J=7.0 Hz), 1.70 (m, 2H), 2.35 (m, 2H), 3.01 (m, 2H), 3.87 (s, 3H), 4.11 (q, 2H, J=7.0 Hz), 4.41 (m, 1H), 4.67 (m, 1H), 5.68 (d, 1H, J=16.0 Hz), 6.49 (d, 1H, J=7.7 Hz), 6.74 (dd, 1H, J=16.0, 5.0 Hz), 6.97-7.38 (m, 22H), 8.31 (d, 1H, J=8.5 Hz), 8.55 (d, 1H, J=8.5 Hz), 8.58 (s, 1H), 11.51 (s, 1H). Anal. (C₄₇ H₄₅ N₄ O₆ F 1.0H₂ O) C, H,N.

Preparation of Product--Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(4-F-Phe)-L-Gln!-E-Propenoate

Using the procedure described in Example 32 for the preparation of compound 20, diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-vinyl! phosphonate, this compound was synthesized by deprotection of ethyl-3- N-(4-methoxyindole-2-carbonyl)-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate in 50% yield: White crystalline solid: IR (KBr) 3422, 3293, 2932, 1719, 1665, 1620, 1541, 1510, 1369, 1261, 1182, 1101, 752 cm⁻¹ ; ¹ H NMR(DMSO-d₆) δ 1.21 (t, 3H, J=7.0 Hz), 1.73 (m, 2H), 2.10 (t, 2H, J=8.0 Hz), 3.02 (m, 2H), 3.88 (s, 3H), 4.13 (q, 2H, J=7.0 Hz), 4.43 (m, 1H), 4.67 (m, 1H), 5.67 (dd, 1H, J=16.0, 1.5 Hz), 6.49 (d, 1H, J=7.0 Hz), 6.75 (bs, 1H), 6.76 (dd, 1H, J=16.0, 5.5 Hz), 6.96 (d, 1H, J=8.5 Hz), 7.03-7.10 (m, 3H), 7.23 (bs, 1H), 7.31-7.39 (m, 3H), 8.31 (d, 1H, J=8.0 Hz), 8.57 (d, 1H, J=8.0 Hz), 11.51 (s, 1H); HRMS calcd for C₂₈ H₃₁ N₄ O₆ F+Cs 671.1282 (M+Cs), found 671.1288. Anal. (C₂₈ H₃₁ N₄ O₆ F) C, H, N.

Example 18--Preparation of Compound 28: Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(3-F-Phe)-L-Gln!-E-Propenoate Preparation of Intermediate BOC-L-(3-F-Phe)-L-(Tr-Glutaminol)

Using the procedure described in Example 16 for the preparation of BOC-L-(4-Cl-Phe)-L-(Tr-glutamninol), this compound was synthesized from BOC-L-3-F-Phe and L-(Tr-glutaminol) in 74% yield. White solid: IR (KBr) 3410, 3302, 3059, 3030, 2974, 2934, 1663, 1491, 1448, 1250, 1167,1051, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.28 (s, 9H), 1.46 (m, 1H), 1.71 (m, 1H), 2.26 (m, 2H), 2.74 (m, 1H), 2.95 (m, 1H), 3.19 (m, 2H), 3.65 (m, 1H), 4.11 (m, 1H), 4.67 (t, 1H, J=5.0 Hz), 6.97-7.32 (m, 19H), 6.89 (d, 1H, J=8.5 Hz), 7.58 (d, 1H, J=8.5 Hz), 8.48 (s, 1H). Anal. (C₃₈ H₄₂ N₃ O₅ F 1.0 H₂ O) C, H, N.

Preparation of Intermediate L-(3-F-Phe)-L-(Tr-Glutaminol) Hydrochloride Salt

Using the procedure described in Example 16 for the preparation of L-(4-Cl-Phe)-L-(Tr-glutaminol) hydrochloride salt, this salt was synthesized from BOC-L-(3-F-Phe)-L-(Tr-glutaminol) in 88% yield. White crystalline solid: IR (KBr) 3231, 3047, 1668, 1491, 1447, 1254, 1145, 1036, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.45 (m, 1H), 1.72 (m, 1H), 2.30 (m, 2H), 2.96-3.11 (m, 3H), 3.25 (m, 1H), 3.70 (m, 1H), 4.03 (m, 1H), 7.06-7.38 (m, 19H), 8.30 (bs, 4H), 8.54 (s, 1H). Anal. (C₃₃ H₃₄ N₃ O₃ F 1.0 HCl 0.5 H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(3-F-Phe)-L-(Tr-Glutaminol)

Using the procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminol), this intermediate was synthesized from 4-methoxyindole-2-carboxylic acid and L-(3-F-Phe)-L-(Tr-glutaiminol) HCl salt, in 60% yield. White solid: IR (KBr) 3291, 3057, 2936, 1956, 1890, 1653, 1361, 1256, 1100, 754, 698 cm⁻¹ ; ¹ H NMR (DMSO-d6) δ 1.58 (m, 1H), 1.81 (m, 1H), 2.28 (m, 2H), 3.02 (m, 2H), 3.28 (m, 2H), 3.70 (m, 1H), 3.87 (s, 3H), 4.68 (m, 2H), 6.49 (m, 1H, J=7.7 Hz), 6.94-7.28 (m, 22H), 7.85 (d, 1H, J=8.5 Hz), 8.50 (d, 1H, J=8.5 Hz), 8.53 (s, 1H), 11.50 (s, 1H). Anal. (C₄₃ H₄₁ N₄ O₅ F 1.0H₂ O) C, H, N.

Preparation of Intermediate N-(4-Methoxyindole-2-Carbonyl)-L-(3-F-Phe)-L-(Tr-Glutaminal)

Using the oxidation procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminal), this aldehyde was prepared in 77% yield from N-(4-methoxyindole-2-carbonyl)-L-(3-F-Phe)-L-(Tr-glutaminol) and was used immediately. Glassy white solid: ¹ H NMR (DMSO-d₆) δ 1.68 (m, 2H), 2.37 (m, 2H), 3.04 (m, 1H), 3.18 (m, 1H), 3.87 (m, 3H), 4.05 (m, 1H), 4.81 (m, 1H), 6.49 (d, 1H, J=7.7 Hz), 6.94-7.30 (m, 22H), 8.60 (m, 2H), 8.62 (s, 1H), 9.33 (s, 1H), 11.48 (s, 1H).

Preparation of Intermediate Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(3-F-Phe)-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate, this vinyl ester was synthesized from N-(4-methoxyindole-2-carbonyl)-L-(3-F-Phe)-L-(Tr-glutaminal) and (carbethoxymethylene)triphenyl-phosphorane in 68% yield. White solid: IR (KBr) 3293, 3057, 2934, 1956, 1894, 1657, 1491, 1368, 1260, 1100, 1036, 978, 756, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.20 (t, 3H, J=7.0 Hz), 1.69 (m, 2H), 2.25 (m, 2H), 3.02 (m, 2H), 3.87 (s, 3H), 4.11 (q, 2H, J=7.0 Hz), 4.42 (m, 1H), 4.69 (m, 1H), 5.71 (d, 1H, J=16.0 Hz), 6.49 (d, 1H, J=8.0 Hz), 6.75 (dd, 1H, J=16.0, 5.0 Hz), 6.91-7.29 (m, 22H), 8.32 (d, 1H, J=8.0 Hz), 8.56 (d, 1H,J=8.0 Hz), 8.59 (s, 1H), 11.51 (s, 1H). Anal. (C₄₇ H₄₅ N₄ O₆ F 0.5 H₂ O) C, H, N.

Preparation of Product--Ethyl-3- N-(4-Methoxyindole-2-Carbonyl)-L-(3-F-Phe)-L-Gln!-E-Propenoate

Using the procedure described in Example 32 for the preparation of compound 20, diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-vinyl!phosphonate, this compound was synthesized by deprotection of ethyl-3- N-(4-methoxyindole-2-carbonyl)-L-(3-F-Phe)-L-(Tr-Gln)!-E-propenoate in 52% yield. White solid: IR (KBr) 3283, 2932, 1663, 1539, 1370, 1256, 1188, 1098, 1036, 978, 752 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.21 (t, 3H, J=7.0 Hz), 1.73 (m,2H), 2.11 (t, 2H, J=7.0 Hz), 3.07 (m, 2H), 3.88 (s, 3H), 4.11 (q, 2H, J=7.0 Hz), 4.49 (m, 1H), 4.75 (m, 1H), 5.72 (dd, 1H, J=16.0, 1.5 Hz), 6.49 (d, 1H, J=7.7 Hz), 6.80 (m, 2H), 6.98-7.31 (m, 8H), 8.32 (d, 1H, J=8.0 Hz), 8.58 (d, 1H, J=8.0 Hz), 11.52 (s, 1H); HRMS calcd for C₂₈ H₃₁ N₄ O₆ F 539.2306 (M+H), found 539.2317. Anal. (C₂₈ H₃₁ N₄ O₆ F) C, H, N.

Example 19--Preparation of Compound 30: Ethyl-3-(CBZ-L-Phe-L-Gln)-E-Propenoate Preparation of Intermediate Ethyl-3- CBZ-L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate (0.60 g, 1.1 mmol), prepared as in Example 3, was deprotected and coupled with CBZ-L-Phe (0.31 g, 1.04 mmol) using the procedure described in Example 28 for the preparation of ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate to provide ethyl-3- CBZ-L-Phe-L-(Tr-Gln)!-E-propenoate (0.400 g, 53%) as a white foam: IR (thin film) 3298, 1651 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.21 (t, 3H, J=7.2 Hz), 1.65-1.75 (m, 1H), 1.90-1.93 (m, 1H), 2.29 (s, br, 2H), 2.98-3.00 (m, 2H), 4.12 (q, 2H, J=7.2 Hz), 4.25-4.30 (m, 1H), 4.93 (d, 1H, J=12.3 Hz), 4.50 (s, br, 1H), 5.01 (d, 1H, J=12.3 Hz), 5.23 (d, 1H, J=6.2 Hz), 5.63 (d, 1H, J=15.6 Hz), 6.39 (d, 1H, J=7.2 Hz), 6.61 (dd, 1H, J=15.6, 5.6 Hz), 6.79 (s, 1H), 7.11-7.34 (m, 25H); Anal. (C₄₅ H₄₅ N₃ O₆) C, H, N.

Preparation of Product--Ethyl-3-(CBZ-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, Ethyl-3- CBZ-L-Phe-L-(Tr-Gln)!-E-propenoate (0.40 g, 0.58 mmol) was deprotected to provide ethyl-3-(CBZ-L-Phe-L-Gln)-E-propenoate (0.15 g, 78%) as a white solid: mp=184°-186° C.; IR (thin film) 3287, 1637, 1533 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.21 (t, 3H, J=7.2 Hz), 1.64-1.80 (m, 2H), 2.08 (t, 2H, J=7.6 Hz), 2.73-2.80 (m, 1H), 2.94 (dd, 1H, J=13.7, 5.3 Hz), 4.11 (q, 2H, J=7.2 Hz), 4.20-4.26 (m, 1H), 4.28-4.39 (m, 1H), 4.95 (s, 2H), 5.69 (d, 1H, J=15.9 Hz), 6.70 (d, 1H, J=5.3 Hz), 6.75-6.77 (m, 2H), 7.17-7.35 (m, 11H), 7.53 (d, 1H, J=8.4 Hz), 8.20 (d, 1H, J=8.1 Hz); Anal. (C₂₆ H₃₁ N₃ O₆) C, H, N.

Example 20--Preparation of Compound 31: Ethyl-3- N-(Propylsulfonyl)-L-Phe-L-Gln!-E-Propenoate Preparation of Intermediate Ethyl-3- BOC-L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- BOC-L-(Tr-Gln)!-E-propenoate (2.26 g, 4.16 mmol), prepared as in Example 3, was dissolved in 1,4-dioxane (15 mL). A solution of HCl in 1,4-dioxane (4.0M, 15 mL) was added dropwise. The reaction solution was stirred at room temperature for 2 hours, then poured into a solution of aqueous NaOH (1M, 80 mL) in saturated aqueous NaHCO₃ (120 mL). The resulting mixture was extracted with CH₂ Cl₂ (2×200 mL). The combined organic phases were dried over NA₂ SO₄ and concentrated to give the free amine intermediate as a slightly yellow solid, which was used without further purification. This crude amine, BOC-L-Phe (1.10 g, 4.15 mmol), and 1-hydroxybenzotriazole hydrate (0.843 g, 6.24 mmol) were stirred in dry CH₂ Cl₂ (35 mL) under argon at room temperature. 4-Methylmorpholine (1.83 mL, 16.6 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.20 g, 6.26 mmol) were added sequentially. After stirring for 3.5 hours, the reaction mixture was poured into water (100 mL), and the mixture was extracted with CH₂ Cl₂ (2×100 mL). The combined organic phases were dried over NA₂ SO₄ and concentrated. The residue was purified by column chromatography (33% acetone in hexanes) to give the product (1.94 g, 68%) as a white foam: IR (thin film) 3413, 3310, 1708, 1660 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.30 (t, 3H, J=7.2 Hz), 1.39 (s, 9H), 1.64-1.77 (m, 1H), 1.88-2.00 (m, 1H), 2.25-2.31 (m, 2H), 2.94-3.07 (m, 2H), 4.18 (q, 2H, J=7.2 Hz), 4.49-4.59 (m, 1H), 4.95 (bs, 1H), 5.66 (d, 1H, J=15.9 Hz), 6.29 (m, 1H), 6.64 (dd, 1H, J=15.9, 5.3 Hz), 6.81 (bs, 1H), 7.14-7.34 (m, 21H); Anal. (C₄₂ H₄₇ N₃ O₆) C, H, N.

Preparation of Intermediate Ethyl-3- L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- BOC-L-Phe-L-(Tr-Gln)!-E-propenoate (0.300 g, 0.435 mmol) was dissolved in 1,4-dioxane (2 mL). A solution of HCl in 1,4-dioxane (4.0M, 2 mL) was added dropwise. The reaction solution was stirred at room temperature for 2.5 hours, then poured into a solution of aqueous NaOH (1M, 10 mL) in saturated aqueous NAHCO₃ (20 mL). The resulting mixture was extracted with CH₂ Cl₂ (3×40 mL). The combined organic phases were dried over Na₂ SO₄ and concentrated to give the product as a foam (0.257 g, quantitative) which was used without further purification.

Preparation of Intermediate Ethyl-3- N-(Propylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- L-Phe-L-(Tr-Gln)!-E-propenoate was dissolved in dry CH₂ Cl₂ (7 mL) under argon and cooled to 0° C. NEt₃ (0.067 mL, 0.48 mmol) and 1-propanesulfonyl chloride (0.054 mL, 0.48 mmol) were added sequentially. After stirring for 1 hour, the reaction mixture was allowed to warm to room temperature. More NEt₃ (0.100 mL, 0.714 mmol) and 1-propanesulfonyl chloride (0.086 mL, 0.76 mmol) were added. After 1.5 hours more, the solvent was evaporated and the residue was purified by column chromatography (50% EtOAc in hexanes) to give the product as a foam (0.121 g, 40%): IR (thin film) 3292, 1713, 1652, 1312, 1144 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.80 (t, 3H,J=7.5 Hz), 1.28 (t, 3H,J=7.2 Hz), 1.34-1.58 (m, 2H), 1.67-1.81 (m, 1H), 1.92-2.04 (m, 1H), 2.32-2.56 (m, 4H, 2.79 (dd, 1H, J=13.9, 8.9 Hz), 3.05 (dd, 1H, J=13.9, 5.5 Hz), 3.96-4.05 (m, 1H), 4.17 (q, 2H, J=7.2 Hz), 4.49-4.59 (m, 1H), 5.14 (d, 1H, J=8.7 Hz), 5.75 (dd, 1H, J=15.9, 1.7 Hz), 6.72 (dd, 1H,J=15.9, 5.3 Hz), 6.94 (s, 1H), 7.02 (d, 1H,J=8.1 Hz), 7.12-7.33 (m, 20H); HRMS (M+Cs) calcd for C₄₀ H₄₅ N₃ O₆ S 828.2083, found 828.2063.

Preparation of Product--Ethyl-3- N-(Propylsulfonyl)-L-Phe-L-Gln!-E-Propenoate

Ethyl-3- N-propylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate (0.100 g, 0.143 mmol) was dissolved in CH₂ Cl₂ /TFA 1:1 (4 mL) under argon. The bright yellow solution was stirred at room temperature for 30 minutes. CCl₄ (4 mL) was added and the solution was concentrated to dryness. The residue was triturated with Et₂ O (3 mL) to give a white precipitate which was collected by filtration and washed with Et₂ O (2×2 mL) to give the product (0.048 g, 74%): mp=161-162° C; IR (KBr) 3284, 3213, 1708, 1666, 1543, 1314, 1138 cm⁻¹ ; ¹ H NMR (acetone-d₆) δ 0.83 (t, 3H, J=7.5 Hz), 1.25 (t, 3H, J=7.2 Hz), 1.39-1.62 (m, 2H), 1.73-2.02 (m, 2H), 2.23-2.30 (m, 2H), 2.54-2.72 (m, 2H), 2.92 (dd, 1H, J=13.5, 8.9 Hz), 3.15 (dd, 1H, J=13.5, 6.1 Hz), 4.14 (q, 2H, J=7.2 Hz), 4.12-4.21 (m, 1H), 4.53-4.63 (m, 1H), 5.79 (dd, 1H, J=15.7, 1.7 Hz), 6.18 (bs, 1H), 6.30 (d, 1H, J=8.7 Hz), 6.78 (dd, 1H, J=15.7, 5.4 Hz), 6.75 (bs, 1H), 7.19-7.35 (m, 5H), 7.59 (d, 1H, J=8.1 Hz); Anal. (C₂₁ H₃₁ N₃ O₆ S) C, H, N.

Example 21--Preparation of Compound 32: Ethyl-3- N-(Benzylsulfonyl)-L-Phe-L-Gln!-E-Propenoate Preparation of Intermediate Ethyl-3- N-(Benzylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-Propenoate

Ethyl-3- L-Phe-L-(Tr-Gln)!-E-propenoate (0.250 g, 0.424 mmol) was dissolved in dry CH₂ Cl₂ (7 mL) under argon and cooled to 0° C. Triethylamine (0.118 mL, 0.847 mmol) and α-toluenesulfonyl chloride (0.162 g, 0.850 mmol) were added sequentially. After stirring for 45 min, the solvent was evaporated and the residue was purified by column chromatography (47% EtOAc in hexanes) to give the product as a white foam (0.154g,49%): IR (thin film) 3296, 1708, 1663, 1316, 1154cm⁻¹ ; ¹ H NMR(CDCl₃) δ 1.29 (t, 3H, J=7.2 Hz), 1.59-1.72 (m, 1H), 1.91-2.03 (m, 1H), 2.31-2.37 (m, 2H), 2.82 (dd, 1H, J=13.7, 7.2 Hz), 2.92 (dd, 1H, J=13.7, 7.2 Hz), 3.78-3.87 (m, 1H), 3.90 (d, 1H, J=13.9 Hz), 3.97 (d, 1H, J=13.9 Hz), 4.17 (q, 2H, J=7.2 Hz), 4.44-4.54 (m, 1H), 4.96 (d, 1H, J=7.8 Hz), 5.59 (dd, 1H, J=15.7, 1.7 Hz), 6.51 (d, 1H, J=7.5 Hz), 6.63 (dd, 1H, J=15.7, 5.1 Hz), 6.91 (s, 1H), 7.03-7.07 (m, 2H), 7.17-7.40 (m, 23H); Anal. (C₄₄ H₄₅ N₃ O₆ S) C, H, N.

Preparation of Product--Ethyl-3- N-(Benzylsulfonyl)-L-Phe-L-Gln!-E-Propenoate

This compound was prepared in 72% yield from ethyl-3- N-(benzylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate using the procedure described in Example 20 for the preparation of ethyl-3- N-(propylsulfonyl)-L-Phe-L-Gln!-E-propenoate: mp=165°-167° C.; IR (KBr) 3330, 3201, 1713, 1660, 1314 cm⁻¹ ; ¹ H NMR (acetone-d₆) δ 1.25 (t, 3H, J=7.2 Hz), 1.72-1.99 (m, 2H), 2.22-2.30 (m, 2H), 2.96 (dd, 1H, J=13.5, 7.3 Hz), 3.10 (dd, 1H, J=13.5, 7.0 Hz), 4.03-4.22 (m, 5H), 4.51-4.62 (m, 1H), 5.72 (dd, 1H, J=15.6, 1.6 Hz), 6.18 (bs, 1H), 6.33 (d, 1H, J=8.4 Hz), 6.72 (bs, 1H), 6.73 (dd, 1H, J=15.6, 5.4 Hz), 7.19-7.35 (m, 10H), 7.55 (d, 1H, J=8.1 Hz); Anal. (C₂₅ H₃₁ N₃ O₆ S) C, H, N.

Example 22--Preparation of Compound 33: Ethyl-3- N-(Ethylsulfonyl)-L-Phe-L-Gln!-E-Propenoate Preparation of Intermediate Ethyl-3- N-(Ethylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-Propenoate

This compound was prepared in 46% yield from ethyl-3- L-Phe-L-(Tr-Gln)!-E-propenoate and ethanesulfonyl chloride using the procedure described in Example 21 for the preparation of ethyl-3- N-(benzylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate. The material was purified by flash column chromatography (50% EtOAc in hexanes): IR (thin film) 3295, 1713, 1666, 1314, 1143 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.04 (t, 3H, J=7.5 Hz), 1.29 (t, 3H, J=7.2 Hz), 1.68-1.81 (m, 1H), 1.95-2.06 (m, 1H), 2.33-2.43 (m, 2H), 2.45-2.58 (m, 1H), 2.59-2.72 (m, 1H), 2.86 (dd, 1H, J=13.7, 8.4 Hz), 3.09 (dd, 1H, J=13.7, 5.6 Hz), 3.96-4.04 (m, 1H), 4.19 (q, 2H, J=7.2 Hz), 4.50-4.59 (m, 1H), 4.91 (bs, 1H), 5.72 (dd, 1H, J=15.9, 1.9 Hz), 6.71 (dd, 1H, J=15.9, 5.3 Hz), 6.87 (s, 1H), 6.96 (d, 1H, J=7.8 Hz), 7.13-7.34 (m, 20H); Anal. (C₃₉ H₄₃ N₃ O₆ S) C, H, N.

Preparation of Product Ethyl-3- N-(Ethylsulfonyl)-L-Phe-L-Gln!-E-Propenoate

This compound was prepared in 82% yield from ethyl-3- N-(ethylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate using the procedure described in Example 20 for the preparation of compound 31, ethyl-3- N-(propylsulfonyl)-L-Phe-L-Gln!-E-propenoate: mp=150°-151° C.; IR (KBr) 3284, 3225, 1713, 1655, 1314, 1138 cm⁻¹ ; ¹ H NMR (acetone-d₆) δ1.05 (t, 3H, J=7.3 Hz), 1.26 (t, 3H, J=7.2 Hz), 1.74-1.87 (m, 1H), 1.90-2.02 (m, 1H), 2.22-2.33 (m, 2H), 2.62-2.84 (m, 2H), 2.95 (dd, 1H, J=13.7, 8.7 Hz), 3.15 (dd, 1H, J=13.7, 6.2 Hz), 4.16 (q, 2H, J=7.2 Hz), 4.13-4.23 (m, 1H), 4.54-4.64 (m, 1H), 5.78 (dd, 1H, J=15.9, 1.6 Hz), 6.22 (bs, 1H), 6.34 (d, 1H, J=9.0 Hz), 6.78 (bs, 1H), 6.78 (dd, 1H, J=15.9, 5.6 Hz), 7.21-7.35 (m, 5H), 7.61 (d, 1H, J=8.1 Hz); Anal. (C₂₀ H₂₉ N₃ O₆ S) C, H, N.

Example 23--Preparation of Compound 34: Ethyl-3- N-(Phenylsulfonyl)-L-Phe-L-Gln!-E-Propenoate Preparation of Intermediate Ethyl-3- N-(Phenylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-Propenoate

This compound was prepared in 55% yield from ethyl-3- L-Phe-L-(Tr-Gln)!-E-propenoate and benzenesulfonyl chloride using the procedure described in Example 21 for the preparation of ethyl-3- N-(benzylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate. The material was purified by flash column chromatography (47% EtOAc in hexanes): IR (thin film) 3295, 1713, 1660, 1308, 1161 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.29 (t, 3H, J=7.2 Hz), 1.59-1.72 (m, 1H), 1.83-1.95 (m, 1H), 2.12-2.33 (m, 2H), 2.82-2.94 (m, 2H), 3.82-3.91 (m, 1H), 4.18 (q, 2H, J=7.2 Hz), 4.31-4.41 (m, 1H), 5.05 (d, 1H, J=7.8 Hz), 5.67 (dd, 1H, J=15.7, 1.7 Hz), 6.60 (dd, 1H, J=15.7, 5.4 Hz), 6.72 (d, 1H, J=7.8 Hz), 6.79 (s, 1H), 6.91-6.97 (m, 2H), 7.13-7.40 (m, 20H), 7.48-7.54 (m, 1H), 7.58-7.62 (m, 2H); Anal. (C₄₃ H₄₃ N₃ O₆ S) C, H, N.

Preparation of Product Ethyl-3- N-(Phenylsulfonyl)-L-Phe-L-Gln!-E-Propenoate

This compound was prepared in 83% yield from ethyl-3- N-(phenylsulfonyl)-L-Phe-L-(Tr-Gln)!-E-propenoate using the procedure described in Example 20 for the preparation of ethyl-3- N-(propylsulfonyl)-L-Phe-L-Gln!-E-propenoate: mp=173°-175° C.; IR (KBr) 3284, 3201, 1708, 1660, 1314, 1161 cm⁻¹ ; ¹ H NMR (acetone-d₆) δ 1.24 (t, 3H, J=7.2 Hz), 1.59-1.85 (m, 2H), 2.07-2.19 (m, 2H), 2.85 (dd, 1H, J=13.5, 7.6 Hz), 2.99 (dd, 1H, J=13.5, 6.7 Hz), 4.03-4.16 (m, 1H), 4.13 (q, 2H, J=7.2 Hz), 4.30-4.40 (m, 1H), 5.65 (dd, 1H, J=15.7, 1.6 Hz), 6.21 (bs, 1H), 6.63 (dd, 1H, J=15.7, 5.6 Hz), 6.74 (bs, 1H), 6.75 (d, 1H, J=8.7 Hz), 7.07-7.29 (m, 5H), 7.42-7.61 (m, 4H), 7.67-7.80 (m, 2H); Anal. (C₂₄ H₂₉ N₃ O₆ S) C, H, N.

Example 24--Preparation of Compound 35: Ethyl-3- CBZ-L-Leu-L-(4-F-Phe)-L-Gln)-E-Propenoate Preparation of Intermediate CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-Glutaminol)

Using the procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminol), this intermediate was synthesized from CBZ-L-Leu and the free base of L-(4-F-Phe)-L-(Tr-glutaminol)-HCl, in 68% yield as a white solid: IR (KBr) 3304, 3063, 2955, 1651, 1510, 1223, 1038,752, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (m, 6H), 1.34 (m, 2H), 1.46 (m, 2H), 1.72 (m, 1H), 2.25 (m, 2H), 2.80 (m, 1H), 2.99 (m, 1H), 3.16 (m, 1H), 3.26 (m, 1H), 3.64 (m, 1H), 3.95 (m, 1H), 4.47 (m, 1H), 4.66 (t, 1H, J=5.5 Hz), 4.97 (d, 1H, J=12.5 Hz), 5.02 (d, 1H, J=12.5 Hz), 7.01 (t, 2H, J=8.8 Hz), 7.15-7.37 (m, 22H), 7.42 (d, 1H, J=7.7 Hz), 7.69 (d, 1H, J=8.5 Hz), 7.87 (d, 1H, J=8 Hz), 8.54 (s, 1H).

Preparation of Intermediate CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-Glutaminal)

Using the oxidation procedure described in Example 16 for the preparation of N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-glutaminal), this aldehyde was prepared from CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-glutaminol) in 92% yield as a white glassy solid, which was used immediately without furrter purification.

Preparation of Intermediate Ethyl-3- CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-Gln)!-E-Propenoate

Using the procedure described in Example 1 for the preparation of compound 12, ethyl-3- CBZ-L-Leu-L-Phe-L-Met(sulfoxide)-E-propenoate, (carbethoxymethylene)triphenyl-phosphorane and CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-glutaminal) were stirred together in THF giving 0.37 g of the crude material contaminated with triphenylphosphine oxide which was subsequently used without further purification. A small amount (27 mg) was purified by flash column chromatography (MeOH/CHCl₃) for spectral analysis: ¹ H NMR (DMSO-d₆) δ 0.79 (t, 6H, J=7.0 Hz), 1.20 (t, 3H, J=7.0 Hz), 1.23-1.82 (m, 5H), 2.25 (m, 2H), 2.85 (m, 1H), 2.95 (m, 1H), 3.96 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.34 (m, 1H), 4.48 (m, 1H), 4.96 (d, 1H, J=13.0 Hz), 5.02 (d, 1H, J=13.0 Hz), 5.57 (d, 1H, J=15.0 Hz), 6.67 (dd, 1H, J=15.0, 5.5 Hz), 7.01 (t, 2H, J=9.0 Hz), 7.13-7.32 (m, 22H), 7.39 (d, 1H, J=8.0 Hz), 7.99 (d, 1H, J=8.0 Hz), 8.07 (d, 1H, J=8.0 Hz), 8.58 (s, 1H).

Preparation of Product Ethyl-3- CBZ-L-Leu-L-(4-F-Phe)-L-Gln)-E-Propenoate

This compound was prepared by the deprotection of ethyl-3- CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate using the procedure describe in Example 32 for the preparation of compound 20, but in the absence of triisopropylsilane. The product was isolated as a white solid in 58% yield (2 steps from CBZ-L-Leu-L-(4-F-Phe)-L-(Tr-glutaminal). IR (KBr) 3439, 3293, 3067, 2961, 1692, 1643, 1539, 1227, 1045, 984, 835, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (m, 6H), 1.21 (t, 3H, J=7.0 Hz), 1.26 (m, 2H), 1.45 (m, 1H), 1.71 (m, 2H), 2.06 (t, 2H, J=7.5 Hz), 2.81 (m, 1H), 2.94 (m, 1H), 3.97 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.37 (m, 1H), 4.47 (m, 1H), 4.98 (d, 1H, J=12.5 Hz), 5.04 (d, 1H, J=12.5 Hz), 5.59 (d, 1H, J=16.0 Hz), 6.68 (dd, 1H, J=16.0, 5.5 Hz), 6.76 (bs, 1H), 7.01 (t, 2H, J=8.8 Hz), 7.19-7.34 (m, 8H), 7.43 (d, 1H, J=8.0 Hz), 8.05 (m, 2H); HRMS calcd for C₃₂ H₄₁ N₄ O₇ F+Cs 745.2014 (M+Cs), found 745.2040 Anal. (C₃₂ H₄₁ N₄ O₇ F 1.25 H₂ O) C, H, N.

Example 25--Preparation of Compound 15: 3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoic Acid Preparation of Intermediate tert-Butyl-3- CBZ-L-Phe-L-(Tr-Gln)!-E-Propenoate

To 0.20 g (0.261 mmol) of CBZ-L-Leu-L-Phe-L-(Tr-glutaminal) was added 3 mL of dry THF. To this stirred solution was added (tert-butoxycarbonylmethylene) triphenylphosphorane (0.098 g, 0.261 mmol). The reaction mixture was stirred at room temperature overnight. The solvent was removed in vacuo, and the residue was subjected to column chromatography with hexanes:EtOAc (6.5:3.5). The product was obtained in 69% yield as a white foam.

Preparation of Product 3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoic Acid

tert-Butyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.157 g, 0.181 mmol) was dissolved in an excess of TFA, and 10 drops of water were added. The mixture was stirred at room temperature for 1 hour and evaporated to dryness. CCl₄ was added and the mixture was concentrated in vacuo to azeotrope any remaining water. The residue was slurried in Et₂ O and the resulting white solid was filtered and dried to give 0.053 g (52%). mp=219°-220° C. (dec); IR (thin film); 2949, 1690, 3269, 1639 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.80 (dd, 6H, J=9.0, 6.5 Hz), 1.23-1.38 (m, 2H), 1.41-1.56 (m, 1H), 1.61-1.79 (m, 2H), 2.0-2.1 (m, 2H), 2.84 (dd, 1H, J=13.6, 8.9 Hz), 2.99 (dd, 1H, J=13.5, 5.1 Hz), 3.91 (m, 1H), 4.32-4.41 (m, 1H), 4.44-4.54 (m, 1H), 5.01 (dd, 1H, J=12.5, 12.1 Hz), 5.64 (d, 1H, J=15.6 Hz), 6.64 (dd, 1H, J=15.6, 5.6 Hz), 6.76 (bs, 1H), 7.14-7.38 (m, 11H), 7.43 (d, 1H, J=7.5 Hz), 7.97 (d, 1H, J=8.1 Hz), 8.04 (d, 1H, J=8.1 Hz), 12.28 (bs, 1H).

Example 26--Preparation of Compound 14: 3-(CBZ-L-Leu-L-Phe-DL-Gln)-E-Propenonitrile Preparation of Intermediate 3- BOC-DL-(Tr-Gln)!-E-Propenonitrile

A solution of diethyl cyanomethylphosphonate (0.202 mL, 1.25 mmol) in dry THF (25 mL) was cooled to -78° C. After dropwise addition of a solution of sodium bis(trimethylsilyl)amide in THF (1.0M, 1.25 mL), the reaction solution was stirred for 20 minutes. A solution of BOC-L-(Tr-glutaminal) (0.590 g, 1.25 mmol) in dry THF (5 mL) was added dropwise, and, after stirring 50 minutes more, saturated aqueous NH₄ CL (4 mL) was added. The reaction mixture was allowed to wann to room temperature, and the THF was evaporated. Water (10 mL) was added to the residue, which was then extracted with CH₂ Cl₂ (3×30 mL). The combined organic phases were dried over NA₂ SO₄ and concentrated. The residue was purified by flash columnn chromatography (38% EtOAc in hexanes) to give the product (0.407 g, 66%) as a white foam: IR (thin film) 3321, 2225, 1694, 1515 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.42 (s, 9H), 1.67-1.81 (m, 1H), 1.82-1.97 (m, 1H), 2.34-2.42 (m, 2H), 4.23 (bs, 1H), 4.97-5.06 (m, 1H), 5.39 (dd, 1H, J=16.3, 1.6 Hz), 6.56 (dd, 1H, J=16.3, 5.3 Hz), 6.77 (bs, 1H), 7.15-7.33 (m, 15H).

Preparation of Intermediate (CBZ-L-Leu-L-Phe)₂ O

CBZ-L-Leu-L-Phe (1.5 g, 3.6 mmol) was dissolved in dry CH₂ Cl₂ (25 mL) at room temperature under argon. 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.697 g, 3.64 mmol) was added. The reaction solution was stirred for 20 hours, then diluted with CH₂ Cl₂ (20 mL) and washed with water (2×20 mL). The combined organic phases were dried over NA₂ SO₄ and concentrated to give the anhydride product as a white semi-solid residue (1.18 g, 80%), which was used immediately in the next step of the reaction without further purification or analysis.

Preparation of Intermediate 3- CBZ-L-Leu-L-Phe-DL-(Tr-Gln)!-E-Propenonitrile

3- BOC-DL-(Tr-Gln)!-E-Propenonitrile (0.349 g, 0.704 mmol) was stirred in 2-propanol (9 mL) at room temperature. Perchloric acid (60%, 3.2 mL) was added dropwise. The resulting solution was stirred for 1 hour under an argon balloon, diluted with CH₂ Cl₂ (100 mL), and poured into a solution of aqueous 1N NaOH/aqueous saturated NAHCO₃ (40 mL:70 mL). The phases were mixed and separated. The aqueous phase was washed again with CH₂ Cl₂ (2×100 mL). The combined organic phases were dried over Na₂ SO₄ and then concentrated to give the crude amine as a white solid (0.314 g), which was used without further purification. This amine was dissolved in acetone (15 mL) and added to the crude (CBZ-L-Leu-L-Phe)₂ O (1.18 g, 1.46 mmol) in a round bottom flask. The reaction solution was stirred at room temperature under an argon balloon. After stirring for 4.5 hours, the solvent was evaporated, and the residue was purified by flash column chromatography (30% EtOAc in hexanes, then 30% acetone in hexanes) to give the product (0.448 g, 81%) as a white foam: IR (thin film) 3298, 2226, 1672, 1519 cm⁻¹ ; Anal. (C₄₉ H₅₁ N₅ O₅) C, H, N.

Preparation of Product 3-(CBZ-L-Leu-L-Phe-DL-Gln)-E-Propenonitrile

3- CBZ-L-Leu-L-Phe-DL-(Tr-Gln)!-E-Propenonitrile (0.381 g, 0.482 mmol) was dissolved in 1:1 CH₂ Cl₂ /TFA (14 mL) under argon, giving a bright yellow solution. After stirring for 30 minutes, the solvent was evaporated. CCl₄ (15 mL) was added, and the resulting solution was concentrated (3 times). The residue was triturated with Et₂ O (8 mL) to give a white solid, which was collected by filtration. This solid was then stirred in acetonitrile (4 mL), collected by filtration, washed with acetonitrile (4 mL), washed with Et₂ O (6 mL), and dried in vacuo (0.099 g, 38%): mp=178°-184° C.; IR (KBr) 3401, 3284, 2225, 1689, 1650, 1537 cm⁻¹ ; ¹ H NMR (DMSO-d₆) (2 diastereomers) δ 0.69 (d, 3H, J=5.3 Hz), 0.73 (d, 3H, J=5.1 Hz), 0.80 (d, 3 H, J=6.6 Hz), 0.83 (d, 3H, J=6.6 Hz), 1.10-1.20 (m, 3H), 1.26-1.40 (m, 2H), 1.46-1.85 (m, 5H), 1.99-2.09 (m, 4H), 2.76 (dd, 1H, J=13.4, 10.9 Hz), 2.83-2.99 (m, 2H), 3.10 (dd, 1H, J=13.6, 4.3 Hz), 3.85-3.93 (m, 1H), 3.96-4.05 (m, 1H), 4.28-4.52 (m, 4H), 4.90-5.07 (m, 5H), 5.71 (d, 1H, J=16.4 Hz), 6.68 (dd, 1H, J=16.4, 4.6 Hz), 6.78 (s, 2H), 6.88 (dd, 1H, J=16.3, 4.7 Hz), 7.16-7.37 (m, 22H), 7.41-7.47 (m, 2H), 7.96 (d, 1H, J=8.2 Hz), 8.03-8.10 (m, 2H), 8.38 (d, 1H, J=8.2 Hz); Anal. (C₃₀ H₃₇ N₅ O₅) C, H, N.

Example 27--Preparation of Compound 6: N-Ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenamide Preparation of Intermediate N-Ethyl-3- BOC-L-(Tr-Gln)!-E-Propenamide

Isobutyl chloroformate (0.161 mL, 1.24 mmol) was added to a solution of 3- BOC-L-(Tr-Gln)!-E-propenoic acid (0.639 g, 1.24 mmol) and 4-methylmorpholine (1.36 mL, 12.4 mmol) in CH₂ Cl₂ at 0° C. The resulting solution was stirred for 20 minutes at 0° C., then ethylamine hydrochloride (0.810 g, 9.93 mmol) was added. The reaction mixture was warmed to 23° C. and was stirred for 24 hours, then was partitioned between water (100 mL) and a 9:1 mixture of CH₂ Cl₂ and CH₃ OH (2×100 mL). The organic layers were dried over NA₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (5% CH₃ OH/CH₂ Cl₂) provided an oil, which was triturated with EtOAc to afford a white solid. The solid was filtered, washed with EtOAc (2×20 mL), and was air-dried to give N-ethyl-3- BOC-L-(Tr-Gln)!-E-propenamide (0.055 g, 8%): mp=240° C. (dec); IR (thin film) 3255, 3085, 1715, 1665, 1612, 1529 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.15 (t, 3H, J=7.2 Hz), 1.42 (s, 9H), 1.63-1.80 (m, 1H), 1.83-2.05 (m, 1H), 2.34-2.39 (m, 2H), 3.29-3.38 (m, 2H), 4.26 (s, br, 1H), 4.75 (s, br, 1H), 5.43 (s, br, 1H), 5.81 (d, 1H, J=15.4 Hz), 6.65 (dd, 1H, J=15.4, 5.9 Hz), 6.85 (s, 1H), 7.19-7.33 (m, 15H); Anal. (C₃₃ H₃₇ N₃ O₄) C, H, N.

Preparation of Intermediate N-Ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenamide

N-Ethyl-3- BOC-L-(Tr-Gln)!-E-propenamide (0.040 g, 0.074 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.030 g, 0.073 mmol) using the procedure described in Example 28 for the preparation of ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate to provide N-ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenamide (0.043 g, 70%) as a white solid: mp=190° C. (dec); IR (thin film) 3283, 3067, 1693, 1642, 1535 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.83 (d, 3H, J=9.0 Hz), 0.85 (d, 3H, J=9.0 Hz), 1.14 (t, 2H, J=7.3 Hz), 1.21-1.32 (m, 1H), 1.37-1.52 (m, 2H), 1.71-1.78 (m, 1H), 1.94-2.05 (m, 1H), 2.26 (t, 2H, J=7.3 Hz), 2.91 (dd, 1H, J=13.8, 7.6 Hz), 3.16 (dd, 1H, J=13.8, 6.2 Hz), 3.26-3.35 (m, 2H), 3.94-4.01 (m, 1H), 4.53-4.55 (m, 2H), 4.89-4.94 (m, 3H), 5.56-5.65 (m, 2H), 6.51 (d, 1H, J=8.1 Hz), 6.60 (dd, 1H, J=15.1, 4.8 Hz), 6.81 (d, 1H, J=8.4 Hz), 7.02 (s, 1H), 7.10-7.36 (m, 26H); Anal. (C₅₁ H₅₇ N₅ O₆) C, H, N.

Preparation of Products N-Ethyl-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenamide

Using the procedure described in Example 4 for the preparation of compound 3, N-ethyl-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenamide was deprotected to produce the product. mp=230° C. (dec), R_(f) =0.28 (10% MeOH in CH₂ Cl₂); IR (KBr) 3404, 3075, 2943, 1692, 1643 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (d, 3H, J=11.5 Hz), 0.80 (d, 3H, J=11.5 Hz), 1.02 (t, 3H, J=7.3 Hz), 1.24-1.29 (m, 2H), 1.32-1.47 (m, 1H), 1.67-1.71 (m, 2H), 2.03-2.08 (m, 2H), 2.77-2.85 (m, 1H), 2.99-3.16 (m, 3H), 3.91-3.98 (m, 1H), 4.29-4.34 (m, 1H), 4.48-4.49 (m, 1H), 4.97 (d, 1H, J=12.5 Hz), 5.04 (d, 1H, J=12.5 Hz), 5.85 (d, 1H, J=15.3 Hz), 6.43 (dd, 1H, J=15.4, 6.4 Hz), 6.75 (s, 1H), 7.20 (bs, 7H), 7.30-7.34 (m, 4H), 7.41 (d, 1H, J=7.8 Hz), 7.90 (d, 1H, J=7.8 Hz), 7.97 (t, 1H, J=5.1 Hz), 8.08 (d, 1H, J=8.1 Hz); Anal. (C₃₂ H₄₃ N₅ O₆) C, H, N.

Example 28--Preparation of Compound 8: Ethyl-2-Fluoro-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate Preparation of Intermediate Ethyl-2-Fluoro-3- BOC-L-(Tr-Gln)!-E-Propenoate

Sodium bis(trimethylsilyl)amide (0.264 mL of a 1.0M solution in THF, 0.264 mmol) was added to a solution of triethyl-2-fluoro-2-phosphonoacetate (0.054 mL, 0.266 mmol) in THF (10 mL) at -78° C., and the resulting solution was stirred for 15 minutes at that temperature. BOC-L-(Tr-Glutaminal) (0.125 g, 0.264 mmol) in THF (10 mL) was added via cannula, and the reaction mixture was stirred for 30 minutes at -78° C. then was partitioned between 0.5M HCl (100 mL) and a 1:1 mixture of EtOAc and hexanes (2×100 mL). The organic layers were dried over NA₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (30% EtOAc in hexanes) provided ethyl-2-fluoro-3- BOC-L-(Tr-Gln)!-E-propenoate (0.094 g, 63%) as a white foam: IR (thin film) 3324, 1724, 1670 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.33 (t, 3H, J=7.2 Hz), 1.41 (s, 9H), 1.92-2.05 (m, 2H), 2.39 (t, 2H, J=7.2 Hz), 4.28 (q, 2H, J=7.2 Hz), 5.00 (bs, 2H), 5.74 (dd, 1H, J=19.8, 8.6 Hz), 6.78 (s, 1H), 7.14-7.32 (m, 15H); Anal. (C₃₃ H,₃₇ FN₂ O₅) C, H, N.

Preparation of Intermediate Ethyl-2-Fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Propenoate.

A solution of HCl in 1,4-dioxane (4 mL of a 4.0M solution, 16 mmol) was added to a solution of ethyl-2-fluoro-3- BOC-L-(Tr-Gln)!-E-propenoate (0.310 g, 0.553 mmol) in the same solvent (4 mL) at 23° C. The reaction mixture was stirred for 4 hours at 23° C., then was concentrated. The resulting oil was dissolved in CH₂ Cl₂, and CBZ-L-Leu-L-Phe (0.228 g, 0.553 mmol), 1-hydroxybenzotriazole hydrate (0.112 g, 0.828 mmol), 4-methylmorpholine (0.182 mL, 1.67 mmol), and 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride (0.159 g, 0.829 mmol) were added sequentially. The reaction mixture was stirred for 12 hours at 23° C., then was partitioned between water (100 mL) and EtOAc (2×100 mL). The organic layers were dried over NA₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (5% CH₃ OH/CH₂ Cl₂) afforded ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate (0.203 g, 43%) as a white foam: IR (thin film) 3394, 3066, 1724, 1647 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.84 (d, 3H, J=5.9 Hz), 0.86 (d, 3H, J=6.2 Hz), 1.32 (t, 3H, J=7.0 Hz), 1.37-1.57 (m, 3H), 1.82-1.84 (m, 2H), 2.26-2.29 (m, 2H), 2.97-2.99 (m, 2H), 3.99-4.05 (m, 1H), 4.26 (q, 2H, J=7.0 Hz), 4.46-4.49 (m, 1H), 4.95 (s, 2H), 5.06 (d, 1H, J=6.5 Hz), 5.16-5.21 (m, 1H), 5.54 (dd, 1H, J=19.9, 9.7 Hz), 6.55 (d, 1H, J=7.5 Hz), 6.79 (d, 1H, J=7.5 Hz), 6.99 (s, 1H), 7.07-7.42 (m, 25H); Anal. (C₅₁ H₅₅ FN₄ O₇) C, H, N.

Preparation of Product Ethyl-2-FIuoro-3-(CBZ-L-Leu-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 4 for the preparation of compound 3, ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate was deprotected to produce the product. mp=210°-211° C., R_(f) =0.57 (10% MeOH in CH₂ Cl₂); IR (KBr) 3401, 3300, 3072, 2943, 1693, 1648 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (d, 3H, J=10.9 Hz), 0.82 (d, 3H, J=10.9 Hz), 1.27 (t, 3H, J=7.2.Hz), 1.32-1.49 (m, 3H), 1.65-1.80 (m, 2H), 1.99-2.06 (m, 2H), 2.78-2.96 (m, 2H), 3.96-4.01 (m, 1H), 4.25 (q, 2H, J=7.2 Hz), 4.39-4.41 (m, 1H), 4.97-5.07 (m, 3H), 5.65 (dd, 1H, J=21.2, 10.0 Hz), 6.74 (s, 1H), 7.16-7.30 (m, 7H), 7.32-7.34 (m, 4H), 7.44 (d, 1H, J=8.1 Hz), 7.94 (d, 1H, J=8.1 Hz), 8.03 (d, 1H, J=7.8 Hz) Anal. (C₃₂ H₄₁ FN₄ O₇) C, H, N.

Example 29--Preparation of Compound 9: Methyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Sulfone Preparation of Intermediate Methyl-(2- BOC-L-(Tr-Gln)!-E-Vinyl) Sulfone

Sodium bis(trimethylsilyl)amide (1.04 mL of a 1.0M solution in THF, 1.04 mmol) was added to a solution of methanesulfonylmethyl-phosphinic acid diethyl ether (0.217 g, 0.943 mmol) in THF (30 mL) at -78° C., and the resulting solution was stirred for 15 minutes at that temperature. BOC-L-(Tr-Glutaminal) (0.446 g, 0.944 mmol) in THF (15 mL) was added via cannula, and the reaction mixture was stirred for 30 minutes at -78° C. then was partitioned between 0.5M HCl (100 mL) and a 1:1 mixture of EtOAc and hexanes (2×100 mL). The organic layers were dried over NA₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (40% hexanes in EtOAc) provided methyl-(2- BOC-L-(Tr-Gln)!-E-vinyl) sulfone (0.359 g, 69%) as a white foam: IR (thin film) 3348, 1688, 1495 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.43 (s, 9H), 1.64-1.81 (m, 1H), 1.83-2.01 (m, 1H), 2.40 (t, 2H,J=6.7Hz), 2.91 (s, 3H), 4.35 (s, br, 1H), 5.01-5.04 (m, 1H), 6.42 (dd, 1H, J=15.0, 1.7 Hz), 6.78 (s, 1H), 6.78 (dd, 1H, J=15.0, 5.0 Hz), 7.18-7.33 (m, 15H); Anal. (C₃₁ H₃₆ N₂ O₅ S) C, H, N.

Preparation of Intermediate Methyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Vinyl) Sulfone.

Using the procedure described in Example 28 for the preparation of ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, methyl-(2- BOC-L-(Tr-Gln)!-E-vinyl) sulfone (0.359 g, 0.654 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.270 g, 0.655 mmol) to provide methyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-vinyl) sulfone (0.160 g, 29%) as a white foam: IR (thin film) 3296, 3061, 1649, 1529 cm³¹ 1 ; ¹ H NMR (CDCl₃) δ 0.84 (d, 3H, J=8.9 Hz), 0.86 (d, 3H, J=8.9 Hz), 1.24-1.36 (m, 2H), 1.42-1.55 (m, 2H), 1.72-1.75 (m, 1H), 1.96-1.99 (m, 1H), 2.23-2.32 (m, 2H), 2.85 (s, 3H), 2.97 (dd, 1H, J=13.8, 7.5 Hz), 3.13 (dd, 1H, J=13.8, 6.1 Hz), 3.92-3.99 (m, 1H), 4.43-4.56 (m, 2H), 4.88 (s, br, 2H), 4.95 (d, 1H, J=5.9 Hz), 6.20 (d, 1H, J=14.9 Hz), 6.47 (d, 1H, J=7.2 Hz), 6.70 (dd, 1H, J=14.9, 4.4 Hz), 6.98 (d, 1H, J=8.1 Hz), 7.09-7.38 (m, 25H).

Preparation of Product--Methyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Sulfone

Using the procedure described in Example 4 for the preparation of compound 3, methyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-vinyl) sulfone was deprotected to produce the product. mp=220° C. (dec), R_(f) =0.44 (10% MeOH in CH₂ Cl₂); IR (KBr) 3413, 3284, 3049, 2951, 1690, 1649 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (d, 3H, J=10.6 Hz), 0.81 (d, 3H, J=10.6 Hz), 1.27-1.38 (m, 2H), 1.40-1.50 (m, 1H), 1.63-1.80 (m, 2H), 2.08 (t, 2H, J=7.5 Hz), 2.82-2.89 (m, 1H), 2.96 (s, 3H), 2.98-3.04 (m, 1H), 3.94-3.99 (m, 1H), 4.45-4.53 (m, 2H), 4.98 (d, 1H, J=12.5 Hz), 5.05 (d, 1H, J=12.5 Hz), 6.38 (d, 1H, J=14.9), 6.60 (dd, 1H, J=15.4, 5.1 Hz), 6.78 (s, 1H), 7.17-7.31 (m, 7H), 7.34-7.36 (m, 4H), 7.43 (d, 1H, J=8.1 Hz), 8.01 (d, 1H, J=8.1 Hz), 8.13 (d, 1H, J=8.1 Hz); Ana;l. (C₃₀ H₄₀ N₄ O₇ S) C, H, N.

Example 30--Preparation of Compound 10: Phenyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Sulfone Preparation of Intermediate Phenyl-(2- BOC-L-(Tr-Gln)!-E-Vinyl) Sulfone

Sodium bis(trimethylsilyl)amide (1.14 mL of a 1.0M solution in THF, 1.14 mmol) was added to a solution of benzenesulfonylmethyl-phosphinic acid diethyl ether (0.304 g, 1.04 mmol) in THF (20 mL) at -78° C., and the resulting solution was stirred for 15 minutes at that temperature. BOC-L-(Tr-Glutaminal) (0.491 g, 1.04 mmol) in THF (10 mL) was added via cannula, and the reaction mixture was stirred for 30 minutes at -78° C. then was partitioned between 0.5M HCl (100 mL) and a 1:1 mixture of EtOAc and hexanes (2×100 mL). The organic layers were dried over NA₂ SO₄ and were concentrated. Purification of the residue by flash column chromatography (gradient elution, 30-40% EtOAc in hexanes) provided phenyl-(2- BOC-L-(Tr-Gln)!-E-vinyl) sulfone (0.540 g, 85%) as a white foam: IR (thin film) 3347, 2250, 1688, 1493 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.37 (s, 9H), 1.73-1.81 (m, 1H), 1.83-1.94 (m, 1H), 2.38 (t, 2H, J=6.7 Hz), 4.33 (s, br, 1H), 4.88-4.90 (m, 1H), 6.37 (dd, 1H, J=15.3, 1.6 Hz), 6.79-6.86 (m, 2H), 7.17-7.32 (m, 15H), 7.49-7.54 (m, 2H), 7.58-7.63 (m, 1H), 7.83-7.87 (m, 2H); Anal. (C₃₆ H₃₈ N₂ O₅ S) C, H, N.

Preparation of Intermediate Phenyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Vinyl) Sulfone

Using the procedure described in Example 28 for the preparation of ethyl-2-fluoro-3- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-propenoate, phenyl-(2- BOC-L-(Tr-Gln)!-E-vinyl) sulfone (0.205 g, 0.336 mmol) was deprotected and coupled with CBZ-L-Leu-L-Phe (0.138 g, 0.335 mmol) to provide phenyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-vinyl) sulfone (0.100 g, 33%) as a white foam: IR (thin film) 3298, 3061, 1652, 1518 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.81 (d, 3H, J=6.9 Hz), 0.83 (d, 3H, J=6.9 Hz), 1.24-1.69 (m, 5H), 1.91 (s, br, 1H), 2.16-2.31 (m, 2H), 2.91 (dd, 1H, J=13.5, 7.5 Hz), 3.05 (dd, 1H, J=13.5, 6.7 Hz), 3.91-3.98 (m, 1H), 4.38-4.45 (m, 1H), 4.54 (s, br, 1H), 4.87 (s, br, 1H), 5.06 (d, 1H, J=6.2 Hz), 6.12 (d, 1H, J=15.3 Hz), 6.57 (d, 1H, J=7.2 Hz), 6.75 (dd, 1H, J=15.3, 4.4 Hz), 6.85 (d, 1H, J=8.4 Hz), 7.05 (d, 1H, J=7.2 Hz), 7.10-7.37 (m, 24H), 7.40-7.62 (m, 3H), 7.79-7.82 (m, 2H); Anal. (C₅₄ H₅₆ N₄ O₇ S) C, H, N.

Preparation of Product--Phenyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Sulfone

Using the procedure described in Example 4 for the preparation of compound 3, phenyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-vinyl) sulfone was deprotected to produce the product. mp=230° C. (dec), R_(f) =0.40 (10% MeOH in CH₂ Cl₂); IR (KBr) 3400, 3288, 3062, 2960, 1685, 1644 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (d, 3H, J=10.6 Hz), 0.81 (d, 3H, J=10.6 Hz), 1.26-1.39 (m, 2H), 1.47-1.59 (m, 1H), 1.61-1.66 (m, 1H), 1.76-1.79 (m, 1H), 2.04 (t, 2H, J=7.0 Hz), 2.77-2.96 (m, 2H), 3.95-4.00 (m, 1H), 4.43-4.45 (m, 2H), 4.96 (d, 1H, J=12.6 Hz), 5.02 (d, 1H, J=12.6 Hz), 6.33 (d, 1H, J=14.9 Hz), 6.74-6.81 (m, 2H), 7.11-7.18 (m, 7H), 7.20-7.38 (m, 4H), 7.42 (d, 1H, J=7.8 Hz), 7.65 (d, 2H, J=7.8 Hz), 7.71 (d, 1H, J=7.5 Hz), 7.82 (d, 2H, J=6.9 Hz), 8.00 (d, 1H, J=7.8 Hz), 8.09 (d, 1H, J=8.1 Hz); Anal. (C₃₅ H₄₂ N₄ O₇ S) C, H, N.

Example 31--Preparation of Compound 11: Ethyl-2-Fluoro-3- BOC-L-(Cyanomethyl)-Ala!-E-Propenoate Preparation of Intermediate BOC-L-Gln-OMe

To a solution of BOC-L-Gln (20 g, 81 mmol) in 50 mL of EtOAC and MeOH at 0° C. was added diazomethane in 250 mL of Et₂ O with stirring. The resulting yellow solution was stirred at 0° C. for 5 minutes and then warmed up to room temperature and stirred for 20 minutes. Argon gas was then bubbled through the yellow reaction mixture to remove excess diazomethane. The crude product was concentrated and purified by crystallization from methyl-tert-butyl ether. Yield 100%. ¹ H NMR (CDCl₃) δ 1.45 (s, 9H), 1.96 (m, 1H), 2.21 (m, 1H), 2.36 (m, 2H), 3.76 (s, 3H,), 4.34 (m, 1H), 5.32 (m, 1H), 5.44 (bs, 1H), 6.16 (bs, 1H). Anal. (C₁₁ H₂₀ N₂ O₅) C, H, N.

Preparation of Intermediate BOC-L-(Cyanomethyl)-Ala-OMe

To a solution of BOC-L-Gln-OMe (10 g, 38 mmol) in 100 mL of pyridine at 0° C. was added 3.5 mL of POCl₃ dropwise. The reaction was warmed to room temperature and stirred overnight. The reaction mixture was diluted with 100 mL EtOAc and washed with 1N HCl (2×50 mL). The organics were combined and dried over NA₂ SO₄, concentrated to yield the crude product which was purified by flash column chromatography (1:4 EtOAc/hexane) to give the product in 67% yield. ¹ H NMR (CDCl₃) δ 1.45 (s, 9H), 2.03 (m, 1H), 2.27 (m, 1H), 2.46 (m, 2H), 3.80 (s, 3H), 4.38 (m, 1H), 5.20 (m, 1H).

Preparation of Intermediate BOC-L-(Cyanomethyl)-Alaninol

This compound was prepared in 84% yield from BOC-L-(cyanomethyl)-Ala-OMe using the procedure described in Example 2 for the preparation of CBZ-L-(N-Ac-amino)-alaninol. The compound was purified by flash column chromatography (50:50 EtOAc/hexane). ¹ H NMR (CDCl₃) δ 1.45 (s, 9H), 1.92 (m, 2H), 2.19 (m, 1H), 2.46 (m, 2H), 3.71 (m, 3H), 4.83 (m, 1H). Anal. (C₁₀ H₁₈ N₂ O₃ 0.4 H₂ O) C, H, N.

Preparation of Intermediate BOC-L-(Cyanomethyl)-Alaninal

To a solution of oxalyl chloride (1.63 g, 12.57 mmol) in CH₂ Cl₂ (30 mL) at -78° C. was added DMSO dropwise (2.01 g, 25.74 mmol). After the addition, the reaction was stirred for 5 minutes. A solution of BOC-L-(cyanomethyl)-alaninol (2.5 g, 11.7 mmol) in 20 mL was added at -78° C. with stirring. After 20 minutes, the reaction was treated with NEt₃ (8.15 mL, 58.5 mmol) and stirred for another 20 minutes. Water (40 mL) was added at -60° C., and then the reaction was warmed up to room temperature. The water layer was separated and extracted with EtOAc (2×50 mL). The organic layers were combined and dried over MgSO₄, and then concentrated to give 2.1 g crude product which was purified by flash column chromatography using a gradient of 3:7 EtOAc/hexane to 5:5 EtOAc/hexane to give the aldehyde in 60% yield. ¹ H NMR (CDCl₃) δ 1.37 (m, 3H), 1.42 (s, 9H), 1.46 (s, 9H), 1.91 (m, 1H), 2.55-2.30 (m, 3H), 4.25 (m, 1H), 5.27 (m, 1H), 9.63 (s, 1H).

Preparation of Intermediate Ethyl-2-Fluoro-3- BOC-L-(Cyanomethyl)-Ala!-E-Propenoate

A solution of triethyl 2-fluoro-phosphonoacetate (0.31 g, 1.27 mmol) in 4 mL THF was cooled at -78° C. and then n-BuLi (0.56 mL of 2.5M solution in hexanes, 1.39 mmol) was added. The resulting solution was stirred at -78° C. for 20 minutes, and then a solution of BOC-L-(cyanomethyl)-alaninal (0.124 g, 0.58 mmol) in 2 mL THF was added to the reaction mixture. The reaction was allowed to stir at -78° C. for 1 hour and then warmed up to room temperature and stirred overnight. Aqueous 6N HCl (10 mL) was added to the reaction, and the organic layer was separated and washed with brine (2×10 mL) and concentrated. The crude product was purified by flash column chromatography (30:70 EtOAc/hexane) to give 0.07 g. product (55% yield). ¹ H NMR (CDCl₃) δ 2.2-1.8 (m, 2H), 2.45 (m, 2H), 4.33 (m, 2H), 4.77 (m, 1H), 5.01 (m, 1H,), 5.89 (m, 1H). Anal. (C₁₄ H₂₁ N₂ O₄ F0.15 H₂ O) C, H,.N. MS calcd for C₁₄ H₂₁ N₂ O₄ F (M+Na), found 323.

Production of Product--Ethyl-2-Fluoro-3- CBZ-L-Leu-L-Phe-L-(Cyanomethyl)-Ala!-E-Propenoate

A solution of ethyl-2-fluoro-3- BOC-L-(cyanomethyl)-Ala!-E-propenoate (0.055 g, 0.18 mmol) in 1 mL CH₂ Cl₂ was cooled to 0° C., and 0.3 mL of TFA was added. The reaction was then warmed to room temperature, stirred for 3 hours, concentrated, and trace amounts of water were removed by toluene azeotrope. This crude product was dissolved in 2 mL DMF and a solution of benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (BOP) (0.12 g, 0.27 mmol), CBZ-L-Leu-L-Phe (0.11 g, 0.27 mmol), and Et₃ N (0.075 mL, 0.54 mmol) was added at 0° C., and the reaction was stirred for 4 hours. This reaction was diluted with saturated aqueous NaHCO₃ solution and extracted with EtOAc (3×15 mL). The organics layers were combined and dried with MgSO₄ and concentrated. The residue was purified by flash column chromatography using a solvent gradient of 1% MeOH/CH₂ Cl₂ to 5% MeOH/CH₂ Cl₂ yielding the product in 37% (2-steps). Anal (C₃₂ H₃₉ N₄ O₆ F) C, H, N. HRMS calcd for C₃₂ H₃₉ N₄ O₆ F+Na 617.2751 (M+Na), found 617.2738.

Example 32--Preparation of Compound 20: Diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Phosphonate Preparation of Intermediate CBZ-L-(Tr-Gln)

CBZ-L-Gln (28.03 g, 100 mmol) was dissolved in 300 mL of glacial acetic acid. To this solution was added triphenylmethanol (26.83 g, 100 mmol), acetic anhydride (18.87 mL, 200 mmol), and 0.5 mL of sulfuric acid. The reaction was heated to 55° C., stirring for one hour. After cooling to room temperature the mixture was concentrated under reduced pressure to one-third the original volume. Ice water was added, and the product extracted with EtOAc. The organic layer was washed with water and brine, dried over MgSO₄, and concentrated. The crude product was recrystallized from CH₂ Cl₂ /hexane, and the resulting crystals washed with Et₂ O, yielding 37.27 g (71%) as a white solid: IR (KBr) 3418, 3295, 3059, 3032, 2949, 2515, 1699, 1628, 1539, 1504, 1447, 1418, 1341, 1242, 1209, 1061, 748, 696 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.71 (m, 1H), 1.88 (m, 1H), 2.38 (m, 2H), 3.97 (m, 1H), 5.04 (s, 2H), 7.14-7.35 (m, 20H), 7.52 (d, 1H, J=7.7 Hz), 8.60 (s, 1H).

Preparation of Intermediate CBZ-L-(Tr-Gln)OMe

CBZ-L-(Tr-Gln) (0.26 g, 0.5 mmol) was added to a stirring solution of 0.25 mL of acetyl chloride in 5 mL of MeOH, and stirring was continued at room temperature for 1 hour. The solvent was removed in vacuo, and the residue dissolved in 100 ml CH₂ Cl₂. The organic layer was washed with water, saturated NaHCO₃, and brine followed by drying over Na₂ SO₄. The crude product was purified on a short flash silica gel column, eluting with 20% EtOAc/hexane. The product (0.23 g, 84%) was obtained as a white solid: IR (KBr) 3405, 3277, 3057, 3034, 2953, 1724, 1643, 1532, 1493, 1447, 1207, 1042, 750, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.16 (t, 1H, J=7.0 Hz), 1.77 (m, 1H), 1.97 (m, 1H), 3.61 (s, 3H), 4.99 (m, 1H), 5.03 (s, 2H), 7.02-7.55 (m, 20H), 7.69 (d, 1H, J=7.7 Hz), 8.59 (s, 1H). Anal. (C₃₃ H₃₂ N₂ O₅) C, H, N.

Preparation of Intermediate CBZ-L-(Tr-Glutaminol)

CBZ-L-(Tr-Gln)OMe (1.50 g, 2.79 mmol) was dissolved in 20 mL of THF and 10 mL of EtOH. LiCl (0.24 g, 5.6 mmol) was added, and the mixture stirred for 10 minutes until all solids had dissolved. NaBH₄ (0.21 g, 5.6 mmol) was added, and the reaction stirred overnight at room temperature. The solvents were removed in vacuo, the residue taken up in water, and the pH was adjusted to 2-3 with 10% HCl. The product was extracted with EtOAc, and the organic layer was washed with water and brine before drying over MgSO₄. The crude product was purified on a short flash silica gel column, eluting with an increasing gradient of EtOAc/benzene, yielding 1.02 g (72%) of a white glassy solid: IR (KBr) 3408, 3318, 3057, 3032, 2947, 1699, 1674, 1516, 1447, 1240, 1059, 752, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.40 (m, 1H), 1.72 (m, 1H), 2.26 (m, 2H), 3.17-3.50 (m, 3H), 4.64 (t, 1H, J=5.0 Hz), 5.00 (s, 2H), 7.00-7.40 (m, 20H), 6.96 (d, 1H, J=8.5 Hz), 8.54 (s, 1H). Anal. (C₃₂ H₃₂ N₂ O₄) C, H, N.

Preparation of Intermediate L-(Tr-Glutaminol)

This amino alcohol was prepared from CBZ-L-(Tr-glutaminol) in 98% yield using the procedure described in Example 2 for the preparation of L-(N-Ac-amino)-alaninol. IR (KBr) 3255, 3057, 3016, 2916, 1642, 1527, 1491, 1446, 1057, 1036, 750, 700, 636 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.29 (m, 1H), 1.53 (m, 1H), 2.29 (m, 2H), 3.08 (m, 1H), 3.18 (m, 2H), 3.38 (bs, 2H), 4.43 (bs, 1H), 7.14-7.28 (m, 15H), 8.62 (s, 1H). Anal. (C₂₄ H₂₆ N₂ O₂) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(Tr-Glutaminol)

Using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninol, this derivative was synthesized from CBZ-L-Leu-L-Phe and L-Tr-glutaminol in 62% yield as awhite solid: IR (KBr) 3302, 3057, 3032, 2951, 1954, 1885, 1657, 1520, 1238, 1045, 746, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (t, 6H, J=7.0 Hz), 1.30 (m, 2H), 1.44 (m, 2H), 1.75 (m, 1H), 2.22 (m, 2H), 2.82 (m, 1H), 2.97 (m, 1H), 3.14 (m, 1H), 3.25 (m, 1H), 3.63 (m, 1H), 3.95 (m, 1H), 4.48 (m, 1H), 4.65 (t, 1H, J=5.0 Hz), 4.96 (d, 1H, J=13.0 Hz), 5.02 (d, 1H, J=13.0 Hz), 7.07-7.33 (m, 25H), 7.42 (d, 1H, J=8.0 Hz), 7.66 (d, 1H, J=8.5 Hz), 7.86 (d, 1H, J=8.0 Hz), 8.52 (s, 1H). Anal. (C₄₇ H₅₂ N₄ O₆ 0.5 H₂ O) C, H, N.

Preparation of Intermediate CBZ-L-Leu-L-Phe-L-(Tr-Glutaminal)

Using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal, this aldehyde was synthesized from CBZ-L-Leu-L-Phe-L-(Tr-glutaminol) in 92% yield as a white glassy solid, which was used immediately. ¹ H NMR (DMSO-d₆) δ 0.79 (t, 6H, J=7.0 Hz), 1.00-1.98 (m, 5H), 2.27 (m, 2H), 2.84 (m, 1H), 3.02 (m, 1H), 3.98 (m, 2H), 4.58 (m, 1H), 4.99 (s, 2H), 7.14-7.32 (m, 25H), 7.39 (d, 1H, J=8.0 Hz), 7.97 (d, 1H, J=8.5 Hz), 8.38 (d, 1H, J=8.0 Hz), 8.60 (s, 1H), 9.20 (s, 1H).

Preparation of Intermediate Diethyl-(2- CBZ-L-Leu-L-Phe-L-(Tr-Gln)!-E-Vinyl) Phosphonate

Tetraethyl methylenediphosphonate (0.21 mL, 0.86 mmol) was dissolved in 10 mL of THF and cooled to 0° C. Potassium bis(trimethylsilyl)amide (0.5M in toluene) was added dropwise via syringe, and the reaction stirred at 0° C. for 30 minutes. After cooling the reaction to -30° C. a solution of CBZ-L-Leu-L-Phe-L-(Tr-glutaminol) (0.63 g, 0.82 mmol) in 6 mL of THF was added dropwise. The reaction was allowed to warm slowly to room temperature and stirred overnight. The solvent was removed by evaporation, and the crude product was purified by flash column chromatography eluting with 1% (saturated anhydrous NH₃ /MeOH)/ CHCl₃ to afford 0.50 g (68%) of a white crystalline solid: IR (KBr) 3289, 3059, 3032, 2957, 1667, 1532, 1447, 1246, 1026, 968, 748, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (t, 6H, J=7.0 Hz), 1.20 (m, 6H), 1.15-1.78 (m, 5H), 2.25 (m, 2H), 2.85 (m, 1H), 2.97 (m, 1H), 3.86-4.07 (m, 5H), 4.32 (m, 1H), 4.51 (m, 1H), 4.95 (d, 1H, J=13.0 Hz), 5.02 (d, 1H, J=13.0 Hz), 5.52 (t, 1H, J=19.0 Hz), 6.48 (t, 1H, J=19.0 Hz), 7.07-7.32 (m, 25H), 7.41 (d, 1H, J=8.0 Hz), 7.97 (d, 1H, J=8.5 Hz), 8.05 (d, 1H, J=8.0 Hz), 8.59 (s, 1H); MS (M+H) 901, (M-H) 899. Anal. (C₅₂ H₆₁ N₄ O₈ P 2.5 H₂ O) C, H, N.

Preparation of Product Diethyl- 2-(CBZ-L-Leu-L-Phe-L-Gln)-E-Vinyl! Phosphonate

The protected amide diethyl- 2-(CBZ-L-Leu-L-Phe-L-Tr-Gln)-E-vinyl! phosphonate (0.469 g, 0.52 mmol) was dissolved in 10 mL of CH₂ Cl₂. Triisopropylsilane (0.52 mL) was added as a triphenylmethyl cation scavenger. TFA (1.0 mL) was added, and the reaction was stirred overnight at room temperature. The reaction was poured into EtOAc and washed with saturated NaHCO₃ solution. The organic layer was separated and washed with water and brine followed by drying over MgSO₄. The product was purified by flash column chromatography eluting with 2-3% MeOH/CHCl₃ to give in 67% yield of a white solid: IR (KBr) 3291, 3063, 2955, 1647, 1541, 1236, 1026, 968, 746, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.79 (m, 6H), 1.21 (t, 6H, J=7.0 Hz), 1.28 (m, 2H), 1.52 (m, 1H), 1.63 (m, 1H), 1.75 (m, 1H), 2.06 (m, 2H), 2.85 (m, 1H), 3.00 (m, 1H), 3.92 (m, 5H), 4.34 (m, 1H), 4.50 (m, 1H), 4.97 (d, 1H, J=13.0 Hz), 5.04 (d, 1H, J=13.0 Hz), 5.54 (t, 1H, J=19.0 Hz), 6.49 (t, 1H, J=19.0 Hz), 6.77 (bs, 1H), 7.15-7.34 (m, 11H), 7.44 (d, 1H, J=8.0 Hz), 8.00 (d, 1H, J=8.5 Hz), 8.03 (d, 1H, J=8.0 Hz); HRMS calcd for C₃₃ H₄₈ N₄ O_(P) 659.3210 (M+H), found 659.3223. Anal. (C₃₃ H₄₈ N₄ O₈ P) C, H, N.

Example 33--Preparation of Compound 29: Ethyl-3- N-(1-Tr-4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-Gln!-E-Propenoate Preparation of Product--Ethyl-3- N-(1-Tr-4-Methoxyindole-2-Carbonyl)-L-(4-Cl-Phe)-L-Gln!-E-Propenoate

This compound was prepared by the deprotection of ethyl-3- N-(4-methoxyindole-2-carbonyl)-L-(4-Cl-Phe)-L-(Tr-Gln)!-E-propenoate, using the procedure described in Example 32 for the preparation of compound 20, but in the absence of triisopropylsilane. ¹ H NMR (DMSO-d₆) δ 1.20 (t, 3H, J=7.0 Hz), 1.74 (m, 2H), 2.03 (t, 2H, J=8.0 Hz), 2.94 (m, 2H), 3.89 (s, 3H), 4.11 (q, 2H, J=7.0 Hz), 4.46 (m, 1H), 4.60 (m, 1H), 5.70 (d, 1H, J=15.0 Hz), 6.54 (d, 1H, J=7.8 Hz), 6.70 (dd, 1H, J=15.0, 5.7 Hz), 6.75 (bs, 1H), 6.87 (d, 1H, J=8.5 Hz), 7.06 (m, 5H), 7.31 (m, 18H), 7.72 (bs, 1H), 8.26 (d, 1H, J=8.2 Hz), 8.61 (d, 1H, J=8.1 Hz); HRMS calcd for C₄₇ H₄₅ N₄ O₆ Cl+Cs 929.2082 (M+Cs), found 929.2078 Anal. (C₄₇ H₄₅ N₄ O₆ Cl 1.0 H₂ O) C, H, N.

Example 34--Preparation of Compound 167: Ethyl-3- Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-Gln!-E-Propenoate. Preparation of Intermediate CBZ-L-Phe-L-(Tr-Glutaminol).

Using the procedure described in Example 16 for the preparation of BOC-L-(4-Cl-Phe)-(Tr-glutaminol), CBZ-L-Phe-L-(Tr-glutaminol) was synthesized from CBZ-L-Phe and L-(Tr-glutaminol) in 67% yield as a white glassy solid: IR (KBr) 3304, 3059, 3030, 2936, 1956, 1887, 1809, 1659, 1495, 1446, 1246, 1036, 750, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.47 (m, 1H), 1.72 (m, 1H), 2.26 (m, 2H), 2.75 (m, 1H), 2.94 (m, 1H), 3.18 (m, 1H), 3.26 (m, 1H), 3.66 (m, 1H), 4.21 (m, 1H), 4.66 (m, 1H), 4.90 (m, 2H), 7.15-7.30 (m, 25H), 7.43 (d, 1H, J=8.5 Hz), 7.72 (d, 1H, J=9.0 Hz), 8.49 (s, 1H). Anal. (C₄₁ H₄₁ N₃ O₅.1.0 H₂ O) C, H, N.

Preparation of Intermediate L-Phe-L-(Tr-Glutaminol).

Using the procedure described in Example 2 for the preparation of L-(N-Ac-amino)-alaninol, L-Phe-L-(Tr-Glutaminol) was synthesized from CBZ-L-Phe-L-(Tr-glutaminol) in quantitative yield as a white glassy solid: IR (KBr) 3293, 3061, 3026, 2938, 2361 , 1669, 1495, 1446, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.46 (m, 1H), 1.78 (m, 1H), 2.28 (m, 2H), 3.10 (m, 2H), 3.21 (m, 1H), 3.25 (m, 1H), 3.62 (m, 1H), 3.86 (t, 1H, J=6.0 Hz), 4.72 (m, 1H), 7.10-7.32 (m, 20H), 8.14 (d, 1H, J=8.0 Hz), 8.53 (s, 1H). MS calcd for C₃₃ H₃₅ N₃ O₃ +H 522, found 522. Anal. (C₃₃ H₃₅ N₃ O₃.0.55 CH₂ Cl₂) C, H, N.

Preparation of Intermediate BOC-L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-Glutaminol).

L-Phe-L-(Tr-Glutaminol) (0.65 g, 1.25 mmol) was dissolved in 5 mL of DMF. Diisopropylethylamine (0.44 mL, 2.5 mmol) was added, followed by 0.29 g (1.25 mmol) of BOC-L-α-t-butylglycine. The reaction was cooled to 0° C. and HATU O-(7-azabenztriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate! (0.48 g, 1.25 mmol) was added. The reaction mixture was allowed to warm to rt at which time the DMF was removed in vacuo. The residue was dissolved with EtOAc, and the organic phase washed consecutively with 10% aq HCl solution, sat. NaHCO₃ solution, H₂ O, and brine. The solvent was dried (MgSO₄) and filtered, and the residue purified by flash silica gel chromatography using a gradient solvent system (0-1.5% MeOH/CHCl₃) to give 0.78 g (85%) of a white amorphous solid: IR (KBr) 3314, 2967, 1657, 1495, 1368, 1246, 1169, 1057, 752, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.78 (s, 9H), 1.37 (s, 10H), 1.72 (m, 1H), 2.23 (m, 2H), 2.80 (m, 1H), 2.92 (m, 1H), 3.08 (m, 1H), 3.21 (m, 1H), 3.60 (m, 1H), 3.83 (d, 1H, J=9.0 Hz), 4.55 (m, 1H), 4.59 (t, 1H, J=5.5 Hz), 6.42 (d, 1H, J=9.0 Hz), 7.14-7.28 (m, 20H), 7.67 (d, 1H, J=8.0 Hz), 7.95 (d, 1H, J=8.0 Hz), 8.45 (s, 1H); Anal. (C₄₄ H₅₄ N₄ O₆.1.0 H₂ O) C, H, N.

Preparation of Intermediate L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-Glutaminol) Hydrochloride Salt.

BOC-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminol) (0.745 g, 1.01 mmol) was dissolved in 2 mL of CH₂ Cl₂ followed by 20 mL of Et₂ O. Dry HCl gas was carefully bubbled into the solution until the white solid stopped precipitating. The reaction mixture hwas concentrated, and 2-3 mL of THF was added which redissolved the white solids. Thin layer chromatography indicated that the reaction went to completion. The THF was removed under vacuum and white solids were washed thoroughly with an excess of Et₂ O and dried to yield L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminol) hydrochloride salt in 95% yield. IR(KBr) 3258, 3057, 2967, 1661, 1520, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.95 (s, 9H), 1.44 (m, 1H), 1.72 (m, 1H), 2.13 (m, 1H), 2.25 (m, 1H), 2.97 (m, 2H), 3.06 (m, 1H), 3.15 (m, 1H), 3.60 (m, 2H), 4.25 (bs, 1H), 4.55 (m, 1H), 7.13-7.27 (m, 20H), 7.89 (d, 1H, J=8.0 Hz), 8.13 (bs, 2H), 8.49 (s, 1H), 8.61 (d, 1H, J=7.7 Hz); Anal. (C₃₉ H₄₆ N₄ O₄. HCl 1.0 H₂ O) C, H, N.

Preparation of Intermediate Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-Glutaminol).

L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-glutaminol) hydrochloride salt (0.61 g, 0.91 mmol) was dissolved in 9 mL of CH₂ Cl₂. Triethylamine (0.26 mL, 1.87 mmol) was added, followed by the addition of 0.097 g (0.91 mL) of ethyl chlorothiolformate. After stirring for five minutes at rt, the solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel eluting with a gradient solvent system (0-2% MeOH/CHCl₃) to give 0.47 g (71%) of a white amorphous solid: IR(KBr) 3300, 3059, 3026, 2967, 1649, 1493, 1194, 750, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) 0.83 δ (s, 9H), 1.16 (t, 3H, J=7.0 Hz), 1.42 (m, 1H), 1.69 (m, 1H), 2.23 (m, 2H), 2.75 (q, 2H, J=7.0 Hz), 2.80 (m, 1H), 2.96 (m, 1H), 3.08 (m, 1H), 3.18 (m, 1H), 3.62 (m, 1H), 4.25 (d, 1H, J=9.0 Hz), 4.48 (m, 1H), 5.75 (t, 1H, J=5.0 Hz), 7.10-7.28 (m, 20H), 7.60 (d, 1H, J=8.5 Hz), 7.93 (d, 1H, J=9.0 Hz), 8.09 (d, 1H, J=7.7 Hz), 8.48 (s, 1H); Anal. (C₄₂ H₅₀ N₄ O₅ S) C, H, N.

Preparation of Intermediate Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-Glutaminal).

Using the general procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide), ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminal) was synthesized from ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminol) in quantitative yield and isolated as a white amorphous solid and used without further purification: ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.16 (t, 3H, J=7.0 Hz), 1.55 (m, 1H), 1.86 (m, 1H), 2.26 (m, 2H), 2.74 (q, 2H, J=7.0 Hz), 2.85 (m, 1H), 2.98 (m, 1H), 3.90 (m, 1H), 4.25 (d, 1H, J=9.0 Hz), 4.59 (m, 1H), 7.14-7.28 (m, 20H), 7.93 (d, 1H, J=9.0 Hz), 8.18 (d, 1H, J=7.7 Hz), 8.38 (d, 1H, J=6.6 Hz), 8.52 (s, 1H), 9.13 (s, 1H).

Preparation of Intermediate Ethyl-3- Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-Gln)!-E-propenoate was synthesized from ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminal) (0.22 g, 0.30 mmol) to give 0.28 g of material contaminated with triphenylphosphine oxide which was used without further purification: white amorphous solid: ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.21 (m, 6H), 1.60 (m, 2H), 2.25 (m, 2H), 2.74 (q, 2H, J=7.0 Hz), 2.82 (m, 1H), 2.92 (m, 1H), 4.09 (q, 2H, J=7.0 Hz), 4.25 (d, 1H, J=9.0 Hz), 4.34 (m, 1H), 4.52 (m, 1H), 5.53 (d, 1H, J=15.5 Hz), 6.63 (dd, 1H, J=15.5, 5.5 Hz), 7.08-7.28 (m, 20H), 7.93 (d, 1H, J=9.0 Hz), 8.07 (d, 1H, J=7.7 Hz), 8.16 (d, 1H, J=7.7 Hz), 8.51 (s, 1H).

Preparation of Product--Ethyl-3- EthyIthiocarbonyl-L-α-(t-ButyI-Gly)-L-Phe-L-Gln!-E-Propenoate.

Ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-Gln)!-E-propenoate, impure with triphenylphosphine oxide (0.28 g), was dissolved in 6 mL of CH₂ Cl₂. TFA (0.6 mL) was added, and the reaction stirred at rt for 4 hours. The reaction was poured into an EtOAc/ sat. NaHCO₃ solution and agitated until white solids began to precipitate out of the organic layer. The aqueous layer was separated, and the solids were filtered and washed with EtOAc to give 0.074 g of a white solid (45% yield from the ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminal); 2 steps): IR(KBr) 3302, 2967, 1645, 1541, 1196 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.18 (m, 6H), 1.67 (m, 2H), 2.03 (m, 2H), 2.75 (q, 2H, J=7.0 Hz), 2.86 (m, 1H), 2.93 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.25 (d, 1H, J=9.0 Hz), 4.35 (m, 1H), 4.49 (m, 1H), 5.55 (d, 1H, J=15.5 Hz), 6.64 (dd, 1H, J=15.5, 5.5 Hz), 6.73 (bs), 7.19 (m, 6H), 7.97 (d, 1H, J=8.5 Hz), 8.07 (d, 1H, J=8.0 Hz), 8.15 (d, 1H, J=7.7 Hz); HRMS calcd for C₂₇ H₄₀ N₄ O₆ S+Cs 681.1723, found 681.1738. Anal. (C₂₇ H₄₀ N₄ O₆ S) C, H, N.

Example 35--Preparation of Compound 168: Ethyl-2-Methyl-3- Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-Gln!-E-Propenoate. Preparation of Intermediate Ethyl-2-Methyl-3- Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-Phe-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-2-methyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-Gln)!-E-propenoate was synthesized from ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminal) (0.22 g, 0.30 mmol) and (carbethoxyethylidene)triphenylphosphorane (0.14 g, 0.37 mmol). The product (0.31 g), a white amorphous solid, contaminated with triphenylphosphine oxide, was isolated after column chromatography and used without further purification: ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.18 (m, 6H), 1.54 (m, 1H), 1.66 (m, 1H), 1.73 (s, 3H), 2.21 (m, 2H), 2.75 (q, 2H, J=7.0 Hz), 2.80 (m, 1H), 2.88 (m, 1H), 4.12 (q, 2H, J=7.0 Hz), 4.24 (d, 1H, J=9.0 Hz), 4.44 (m, 2H), 6.27 (d, 1H, J=8.5 Hz), 7.13-7.27 (m, 20H), 7.95 (d, 1H, J=9.0 Hz), 8.03 (d, 1H, J=8.0 Hz), 8.09 (d, 1H, J=7.0 Hz), 8.51 (s, 1H).

Preparation of Product--Ethyl-2-Methyl-3- Ethylthiocarbonyl-L-α-(t-Butyl-Gly)-L-Phe-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-2-methyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate was synthesized from ethyl-2-methyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-Gln)!-E-propenoate and isolated as a white glassy solid after purification by column chromatography on silica gel using a gradient solvent system (0-2% MeOH/CHCl₃) (58% yield; two steps from ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-(Tr-glutaminal): IR (KBr) 3302, 2967, 1647, 1541, 1261, 1202 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.18 (m, 6H), 1.65 (m, 1H), 1.69 (m, 1H), 1.77 (s, 3H), 2.00 (m, 2H), 2.75 (q, 2H, J=7.0 Hz), 2.86 (m, 2H), 4.12 (q, 2H, J=7.0 Hz), 4.24 (d, 1H, J=9.0 Hz), 4.42 (m, 2H), 6.26 (d, 1H, J=8.5 Hz), 6.71 (bs, 1H), 7.15 (m, 6H), 7.96 (d, 1H, J=9.0 Hz), 8.03 (d, 1H, J=7.7 Hz), 8.07 (d, 1H, J=7.0 Hz); HRMS calcd for C₂₈ H₄₂ N₄ O₆ S+Cs 695.1879, found 695.1864. Anal. (C₂₈ H₄₂ N₄ O₆ S.0.2 CHCl₃) C, H, N.

Example 36--Preparation of Compound 178:

Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-Gln!-E-Propenoate.

Preparation of Intermediate BOC-L-(S-Me-Pen)-L-Phe-L-(Tr-Glutaminol).

L-Phe-L-(Tr-Glutaminol) (0.64 g, 1.25 mmol) was dissolved in 4 mL of DMF. Diisopropylethylamine (0.43 mL, 2.46 mmol) was added, followed by BOC-S-methyl-L-penicillamine (0.32 g, 1.25 mmol; generated from the BOC-S-methyl-L-penicillamine dicyclohexylammonium salt (Sigma Chemical, St. Louis, Mo.) and aq HCl/EtOEt extraction and drying by benzene azeotrope). The solution was cooled to 0° C., HATU(O-7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate! (0.468.g, 1.25 mmol) was added, and the reaction mixture was allowed to warm to rt. The DMF was then removed in vacuo, the residue was dissolved with EtOAc, and the organic phase was washed consecutively with 10% HCl solution, sat NaHCO₃, H₂ O, and brine. The organic phase was dried over MgSO₄, filtered, and concentrated to give a residue which was purified by column chromatography on silica gel using a gradient solvent system (0-1% MeOH/CHCl₃) to yield 0.76 g (81%) of a white amorphous solid: IR (KBr) 3308, 2937, 1695, 1677, 1506, 1493, 1448, 1367, 1246, 1165, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.07 (s, 3H), 1.19 (s, 3H), 1.37 (s, 9H), 1.66-1.75 (m, 2H), 1.94 (s, 3H), 2.19-2.25 (m, 2H), 2.78-2.83 (m, 1H), 2.95-3.01 (m, 1H), 3.06-3.12 (m, 1H), 3.19-3.23 (m, 1H), 3.62-3.65 (m, 1H), 4.12 (d, 1H, J=3.0 Hz), 4.48-4.55 (m, 1H), 4.59-4.62 (m, 1H), 6.50 (d, 1H, J=9.0 Hz), 7.14-7.28 (m, 20H), 7.62 (d, 1H, J=6.0 Hz), 8.21 (d, 1H, J=6.0 Hz), 8.47 (s, 1H). MS calcd for C₄₄ H₅₄ N₄ O₆ S+H 767, found 767.

Preparation of Intermediate L-(S-Me-Pen)-L-Phe-L-Tr-Glutaminol) Hydrochloride Salt.

To a solution of BOC-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol) (0.69 g, 0.91 mmol) in 6 mL of 1,4-dioxane was added 4 mL of 4M HCl/1,4-dioxane. The reaction mixture was stirred at rt for 3 h under an argon atmosphere. At this time the solvent was removed in vacuo to give 0.61 g (97%) of a white solid which was used without further purification: IR (KBr) 3313, 3057, 2926, 1664, 1493, 1448, 750, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.18 (s, 3H), 1.39 (s, 3H), 1.66-1.78 (m, 2H), 2.01 (s, 3H), 2.06-2.15 (m, 1H), 2.27-2.39 (m, 1H), 2.83-3.08 (m, 2H), 3.14-3.29 (m, 2H), 3.33-3.40 (m, 3H), 3.59-3.68 (m, 1H), 3.84-3.89 (m, 1H), 7.13-7.27 (m, 20H), 7.91 (d, 1H, J=9.0 Hz), 8.15-8.26 (m, 2H), 8.52 (s, 1H), 8.76 (d, 1H, J=6.0 Hz).

Preparation of Intermediate Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-Glutaminol).

A solution of cyclopentyl chlorothiolformate (0.133 g, 0.81 mmol), prepared as described in Example 37, in 2 mL of CH₂ Cl₂ was added dropwise to a solution of L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol) hydrochloride salt (0.57 g, 0.81 mmol) in 10 mL of CH₂ Cl₂. To this solution was added 0.24 mL(7 mmol) of Et₃ N. The reaction mixture was stirred for 15 min at rt, and the solvent was removed under vacuum. The residue was purified by column chromatography on silica gel chromatography using a gradient solvent system (0-2% MeOH/CHCl₃) to give 0.512 g (80%) of a white amorphous solid: IR (KBr) 3358, 2939, 1649, 1516, 1448, 1190, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.13 (s, 3H), 1.23 (s, 3H), 1.37-1.63 (m, 10H), 1.96 (s, 3H), 1.98-2.01 (m, 1H), 2.16-2.33 (m, 1H), 2.7-2.89 (m, 1H), 3.07-3.23 (m, 2H), 3.24-3.28 (m, 1H), 3.53-3.57 (m, 1H), 3.59-3.66 (m, 1H), 4.37-4.47 (m, 1H), 4.54-4.60 (m, 2H), 7.14-7.28 (m, 20H), 7.55 (d, 1H, J=9.0 Hz), 7.99 (d, 1H, J=9.0 Hz), 8.36 (d, 1H, J=6.0 Hz), 8.49 (s, 1H). MS calcd for C₄₅ H₅₄ N₄ O₅ S₂ +H 795, found 795.

Preparation of Intermediates Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-Glutaminal) & Cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-(Tr-Glutaminal).

Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol) (0.46 g, 0.58 mmol) was dissolved in 10 mL of anh DMSO. o-Iodoxybenzoic acid (0.48 g, 1.73 mmol) was added, and the reaction mixture was stirred at rt for 3 h. The DMSO was removed under high vacuum. The residue was twice diluted with CH₂ Cl₂ and the solvent was evaporated to remove any residual DMSO. The residue was diluted with EtOAc, and triturated to form a white solid which was filtered off. The filtrate was washed with an aq 10% Na₂ S₂ O₃ /10% NaHCO₃ solution, water and brine and dried over MgSO₄. Filtration and concentration gave 0.40 g (87%) of a white glassy solid which was used without further purification. The product was shown to be a mixture of the sulfide and sulfoxide by NMR analysis. ¹ H NMR (DMSO₆) (mixture of sulfide and sulfoxide) δ 1.12 (s), 1.24 (s), 1.32 (s), 1.45-1.66 (m), 1.95-2.13 (m), 2.29 (s), 2.40 (s), 2.53 (s), 2.82-2.87 (m), 2.99-3.23 (m), 3.52-3.57 (m), 3.95-4.03 (m), 4.55-4.83 (m), 7.14-7.28 (m), 7.89-8.06 (m), 8.41-8.58 (m), 9.15 (s), 9.18 (s).

Preparation of Intermediates Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-Gln)!-E-Propenoate & Ethyl-3-(Cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L- Tr-Gln!)-E-Propenoate.

The mixture of cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminal) and cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-(Tr-glutaminal) (0.40 g, approximately 0.51 mmol) was dissolved in 10 mL of anh THF. To this solution was added (carbethoxymethylene) triphenylphosphorane (0.21 g, 0.61 mmol), and the reaction mixture was stirred overnight at rt. The solvent was removed in vacuo, and the residue was purified by column chromatography on silica gel using a gradient solvent system (0-2% MeOH/CHCl₃) to give 0.184 g of the sulfide product and 0.132 g sulfoxide product (contaminated with triphenylphosphine oxide): Ethyl-3- cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-Gln)!-E-propenoate: ¹ H NMR (DMSO-d₆) δ 1.14 (s, 3H), 1.21 (t, 3H, J=6.0 Hz), 1.24 (s, 3H), 1.46-1.68 (m, 10H), 1.96 (s, 3H), 2.25-2.31 (m, 2H), 2.78-2.85 (m, 1H), 2.96-3.00 (m, 1H), 3.54-3.72 (m, 1H), 4.05-4.13 (m, 2H), 4.32-4.47 (m, 1H), 4.49-4.55 (m, 1H), 4.56-4.59 (m, 1H), 5.57 (d, 1H, J=15.0 Hz), 6.64 (dd, 1H, J=15.0, 3.0 Hz), 7.13-7.26 (m, 20H), 7.99-8.04 (m, 2H), 8.45 (d, 1H, J=9.0 Hz), 8.55 (s, 1H). Ethyl-3-(cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L- Tr-Gln!)-E-propenoate: ¹ H NMR (DMSO-d₆) (mixture of diastereomers): δ 1.11-1.15 (m), 1.19-1.23 (m), 1.35-1.66 (m), 1.98-2.00 (m), 2.18-2.35 (m), 2.41 (s), 2.64-2.83 (m), 2.89-3.02 (m), 3.51-3.56 (m), 4.11 (q, J=6.0 Hz), 4.34-4.40 (m), 4.48-4.59 (m), 4.63-4.66 (m), 5.51-5.57 (m), 6.61-6.68 (m), 7.13-7.28 (m), 8.12-8.24 (m), 8.42-8.53 (m), 8.55-8.57 (m).

Preparation of Product--Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-Gln!-E-Propenoate

Ethyl-3 - cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-Gln)!-E-propenoate (0.184 g) was dissolved in 10 mL CH₂ Cl₂. To this solution was added 1 mL of trifluoroacetic acid, and the reaction mixture was stirred at rt overnight. The solvent was removed under vacuum and the residue was purified by column chromatography on silica gel using a gradient solvent system (0-2% MeOH/CHCl₃) to give 0.044 g (24%; 3 steps from cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol)) as a white amorphous solid: IR (KBr) 3296, 2984, 1787, 1655, 1560, 1541, 1280, 1194 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.14 (s, 3H), 1.21 (t, 3H, J=6.0 Hz), 1.25 (s, 3H), 1.40-1.70 (m, 10H), 2.02 (s, 3H), 2.05-2.24 (m, 2H), 2.79-2.86 (m, 1H), 2.93-3.00 (m, 1H), 3.43-3.55 (m, 1H), 4.09 (q, 2H, J=6.0 Hz), 4.31-4.36 (m, 1H), 4.43-4.50 (m, 1H), 4.56 (d, 1H, J=6.0 Hz), 5.58 (d, 1H, J=15.0 Hz), 6.65 (dd, 1H, J=15.0, 6.0 Hz), 6.75 (bs, 1H), 7.15-7.21 (m, 6H), 7.99-8.06 (m, 2H), 8.45 (d, 1H, J=6.0 Hz). HRMS calcd for C₃₀ H₄₄ N₄ O₆ S₂ +Cs 753.1757, found 753.1737. Anal. (C₃₀ H₄₄ N₄ O₆ S₂) C, H, N, S.

Example 37--Preparation of Compound 173: Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-Gln!-E-Propenoate. Preparation of Intermediate Cyclopentyl Chlorothiolformate.

Cyclopentanethiol (10.7 mL, 0.1 mol) was dissolved in 200 mL of CH₂ Cl₂. Triphosgene (11.13 g, 37.5 mmol) was added and the reaction mixture was cooled to 0° C. Et₃ N (14.1 mL, 0.1 mol) was added dropwise, and the reaction was allowed to warm to room temperature over a period of one hour. The solvent was carefully removed under reduced pressure at 20° C. due to the volatility of the product. The resulting residue was taken up in Et₂ O, and the solids were filtered and washed with more Et₂ O. The solvent was again carefully removed under reduced pressure, and the was product purified by distillation (85% yield): colorless liquid (bp 70°-74° C.; 1 torr): IR(neat) 1756, 830 cm⁻¹ ; ¹ H NMR (benzene-d₆) δ 1.01-1.23 (m, 6H), 1.49-1.60 (m, 2H), 3.20-3.29 (m, 1H).

Preparation of Intermediate BOC-L-(S-Ph-Cys).

To a suspension of 19.73 g (0.1 mol) L-(S-Ph-Cys) (purchased from Davos Chemical Corp., Englewood Cliffs, N.J.) in 72 mL of tert-butanol was added a solution of NaOH (4.1 g, 0.1025 mol) in 100 mL H₂ O. Once the suspension became a clear solution di-tert-butyl dicarbonate (22.92 g, 0.105 mol) was added. The clear solution became a slurry and was allowed to stir at rt overnight. At this time the turbid solution was washed twice with pet. ether. The organic layer was washed 3 times with a sat NaHCO₃ solution and the aqueous layers were combined. The aqueous layer was then carefully acidified to pH 2-3 with a sat KHSO₄ solution and extracted with a large excess of EGO. The organic phase was dried over Na₂ SO₄, filtered and concentrated under vacuum to give 27.4 g (92%) of BOC-L-(S-Ph-Cys) as white solid. Any residual H₂ O and/or tert-butanol was removed by benzene azeotrope before using the material. ¹ H NMR (DMSO-d₆) δ 1.36 (s, 9H), 3.10 (dd, 1H, J=13.6, 9.6 Hz), 3.34 (dd, 1H, J=13.6, 4.4 Hz), 4.01 (m, 1H), 7.20 (m, 2H), 7.34 (m, 3H), 12.82 (bs, 1H).

Preparation of Intermediate BOC-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol).

BOC-L-(S-Ph-Cys) (0.45 g, 1.5 mmol) was dissolved in 2 mL of DMF and 2 mL of CH₂ Cl₂. To this solution was added N-hydroxysuccinimide (0.17 g, 1.5 mmol), followed by dicyclohexylcarbodiimide (0.31 g, 1.5 mmol). The reaction was stirred at rt for 2 h. The mixture was then filtered into a separate flask containing L-Phe-L-(Tr-glutaminol) (0.78 g, 1.5 mmol) dissolved in 4 mL of DMF and 2 mL of CH₂ Cl₂. The reaction mixture was stirred overnight and the solvent was removed in vacuo. The residue was purified by column chromatography on silica gel using a gradient solvent system (0-2% MeOH/CHCl₃) to give 1.06 g (88%) of a white amorphous solid: IR (KBr) 3304, 3061, 2972, 2928, 1645, 1516, 1493, 1367, 1248, 1165, 1024, 742, 698 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.35 (s, 9H), 1.35-1.43 (m, 1H), 1.70-1.74 (m, 1H), 2.20-2.33 (m, 2H), 2.82-2.92 (m, 1H), 2.93-3.10 (m, 1H), 3.11-3.23 (m, 2H), 3.24-3.32 (m, 2H), 3.58-3.68 (m, 1H), 3.80-3.98 (m, 1H), 4.58-4.64 (m, 1H), 4.65-4.77 (m, 1H), 7.14-7.30 (m, 26H), 7.75 (d, 1H, J=6.0 Hz), 7.83 (d, 1H, J=6.0 Hz), 8.51 (s, 1H). MS calcd for C₄₇ H₅₂ N₄ O₆ S+H 801, found 801.

Preparation of Intermediate L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) Hydrochloride Salt.

Using the procedure described in Example 36 for the preparation of L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol) hydrochloride salt, L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) hydrochloride salt was synthesized from BOC-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) to give 0.182 g of white solid which was used without further purification: IR (KBr) 3325, 3057, 2949, 1685, 1655, 1560, 1493, 1448, 746, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.41-1.67 (m, 1H), 1.69-1.81 (m, 1H), 2.26-2.44 (m, 2H), 2.86-2.97 (m, 1H), 2.98-3.23 (m, 1H), 3.25-3.43 (m, 4H), 3.60-3.84 (m, 2H), 4.02-4.20 (m, 1H), 4.44-4.60 (m, 1H), 7.08-7.48 (m, 25H), 7.87 (d, 1H, J=6.0 Hz), 8.46 (bs, 3H), 8.55 (s, 1H), 8.87 (d, 1H, J=6.0 Hz).

Preparation of Intermediate Cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-Glutaminol).

Using the procedure described in Example 36 for the preparation of cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol), cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) was synthesized from L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) hydrochloride salt in 75% yield: white amorphous solid: IR (KBr) 3288, 3059, 2960, 1637, 1494, 1448, 1205, 746, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.42-1.98 (m, 10H), 1.99-2.26 (m, 1H), 2.48-2.50 (m, 1H), 2.96-2.98 (m, 1H), 3.01-3.19 (m, 1H), 3.19-3.55 (m, 6H), 3.64-3.85 (m, 1H), 4.36-4.40 (m, 1H), 4.46-4.58 (m, 1H), 7.14-7.30 (m, 25H), 7.68 (d, 1H, J=6.0 Hz), 8.01 (d, 1H, J=6.0 Hz), 8.41 (d, 1H, J=6.0 Hz), 8.52 (s, 1H). MS calcd for C₄₈ H₅₂ N₄ O₅ S₂ +H 829, found 829.

Preparation of Intermediate Cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-Glutaminal).

Using the procedure described in Example 36 for the preparation of cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminal) and cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-(Tr-glutaminal), cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminal) was synthesized from cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminol) in 98% yield: white amorphous solid used without further purification: ¹ H NMR (DMSO-d₆) δ 1.45-1.70 (m, 8H), 2.02-2.28 (m, 3H), 2.35-2.51 (m, 1H), 2.95-3.02 (m, 2H), 3.04-3.22 (m, 1H), 3.24-3.36 (m, 1H), 3.56-3.59 (m, 1H), 4.02-4.08 (m, 1H), 4.47-4.59 (m, 1H), 4.60-4.80 (m, 1H), 7.20-7.36 (m, 25H), 8.22 (d, 1H, J=6.0 Hz), 8.43-8.48 (m, 2H), 8.65 (s, 1H), 9.27 (s, 1H).

Preparation of Intermediate Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-3- cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-Gln)!-E-propenoate was synthesized from cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminal) to give 0.26 g of material contaminated with triphenylphosphine oxide (after column chromatography) which was used without further purification: ¹ H NMR (DMSO-d₆) δ 1.19 (t, 3H, J=6.0 Hz), 1.47-1.59 (m, 10H), 1.93-2.23 (m, 1H), 2.25-2.34 (m, 1H), 2.83-2.93 (m, 1H), 2.95-3.16 (m, 1H), 3.19-3.29 (m, 2H), 3.51-3.56 (m, 1H), 4.09 (q, 2H, J=6.0 Hz), 4.35-4.44 (m, 2H), 4.46-4.48 (m, 1H), 5.64 (d, 1H, J=15.0 Hz), 6.68 (dd, 1H, J=15.0, 3.0 Hz), 7.13-7.29 (m, 25H), 8.07 (d, 1H, J=6.0 Hz), 8.13 (d, 1H, J=6.0 Hz), 8.42 (d, 1H, J=6.0 Hz), 8.58 (s, 1H).

Preparation of Product--Ethyl-3- Cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-3- cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-Gln!-E-propenoate was synthesized from ethyl-3- cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-Gln)!-E-propenoate in 35% yield (2 steps from cyclopentylthiocarbonyl-L-(S-Ph-Cys)-L-Phe-L-(Tr-glutaminal)): white amorphous solid: IR (Pr) 3294, 1712, 1655, 1633, 1545, 1203, 738, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.19 (t, 3H, J=6.0 Hz), 1.56-1.76 (m, 10H), 1.98-2.08 (m, 2H), 2.84-2.99 (m, 2H), 3.17-3.39 (m, 2H), 3.51-3.76 (m, 1H), 4.08 (q, 2H, J=6.0 Hz), 4.39-4.45 (m, 3H), 5.64 (d, 1H, J=15.0 Hz), 6.69 (dd, 1H, J=15.0, 3.0 Hz), 6.77 (bs, 1H), 7.18-7.32 (m, 11H), 8.08 (d, 1H, J=6.0 Hz), 8.18 (d, 1H, J=6.0 Hz), 8.43 (d, 1H, J=6.0 Hz). HRMS calcd for C₃₃ H₄₂ N₄ O₆ S₂ +Cs 787.1600, found 787.1618. Anal. (C₃₃ H₄₂ N₄ O₆ S₂) C, H, N, S.

Example 38--Preparation of Compound 174: Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-Propenoate. Preparation of Intermediate Fmoc-L-(4-Me-Phe)-L-(Tr-Glutaminol).

Using the procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninol, this derivative was synthesized from Fmoc-L-4-Me-Phe (purchased from Neosystems Laboratories, Strasbourg, France) and L-(Tr-glutaminol) in 85% yield and isolated as a white solid. IR (KBr) 3316, 3283, 3024, 2946, 1694, 1667, 1448, 1256, 1041, 760, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.56 (m, 1H), 1.77 (m, 1H), 2.22 (s, 3H), 2.26 (m, 2H), 2.74 (m, 1H), 2.90 (m, 1H), 3.17 (m, 1H), 3.69 (m, 1H), 4.03-4.23 (m, 4H), 7.03-7.54 (m, 21H), 7.39 (t, 2H, J=7.4 Hz), 7.50 (d, 1H, J=8.5 Hz), 7.59 (d, 1H, J=7.4 Hz), 7.60 (d, 1H, J=7.7 Hz), 7.70 (d, 1H, J=8.8 Hz), 7.87 (d, 2H, J=7.4 Hz), 8.45 (s, 1H); MS calcd for C₄₉ H₄₇ N₃ O₅ +Cs 890, found 890.

Preparation of Intermediate L-(4-Me-Phe)-L-(Tr-Glutaminol).

To a solution of Fmoc-L-(4-Me-Phe)-L-(Tr-glutaminol) (3.25 g, 4.29 mmol) in anh DMF (10 mL) was added piperidine (0.51 mL, 5.15 mmol). The solution was stirred and monitored by TLC. Upon consumption of the starting material, the reaction mixture was concentrated to a residue and then subjected to column chromatography on silica gel (5% MeOH/CH₂ Cl₂) to afford the product as white solid in 87% yield. IR (KBr) 3326, 3054, 3030, 2953, 2872, 1651, 1516, 1491, 1447, 1036, 700 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 1.47 (m, 1H), 1.75 (m, 3H), 2.13 (m, 1H), 2.23 (s, 3H), 2.57 (dd, 1H, J=13.2, 8.1 Hz), 2.88 (dd, 1H, J=13.6, 4.8 Hz), 3.20 (m, 1H), 3.30 (m, 1H), 3.66 (m, 1H), 4.64 (t, 1H, J=5.5 Hz), 7.07 (m, 4H), 7.10-7.28 (m, 15H), 7.62 (d, 1H,J=8.8 Hz), 8.54 (s, 1H); MS calcd for C₃₄ H₃₇ N₃ O₃ +Na 558, found 558.

Preparation of Intermediate Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly).

A stirred suspension of L-α-(t-butyl-Gly) (0.656 g, 5.0 mmol) in 18 mL CH₂ Cl₂, and diisopropylethylamine (3.5 mL, 20 mmol) was cooled to 0° C. To this mixture chlorotrimethylsilane (0.83 mL, 6.5 mmol) was added dropwise. The slurry was allowed to warm to rt, and the mixture was stirred for about 2 h. At this time the mixture was recooled to 0° C., and cyclopentyl chlorothiolformate (0.823 g, 5.0 mmol) was added dropwise. The slurry became a pale yellow solution after stirring at rt for approximately 5 h. The solution was concentrated, redissolved in an excess of EtOAc and washed with H₂ O, 10% aq KHSO₄, H₂ O and brine. The organic phase was dried over MgSO₄, filtered and concentrated to give cyclopentylthiocarbonyl-L-α-(t-butyl-Gly) as a yellow oil in nearly quantitative yield which was azeotroped with benzene to remove any residual water before being used in the next step. IR (film) 3324, 2965, 2920, 2872, 1726, 1642, 1518, 1202 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 1.03 (s, 9H), 1.48-1.73 (m, 6H), 2.10 (m, 2H), 3.72 (m, 1H), 4.46 (m, 1H), 5.79 (m, 1H); MS calcd for C₁₂ H₂₁ NO₃ S+Na 282, found 282.

Preparation of Intermediate Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Glutaminol).

This preparation was carried out following the procedure of L. A. Carpino, J. Am. Chem. Soc. 1993, 115, 4397. Cyclopentylthiocarbonyl-L-α-(t-butyl-Gly) (0.325 g, 1.25 mmol) was dissolved in 8.0 mL of DMF. Diisopropylethylamine (0.45 mL, 2.5 mmol) was added, followed by 0.67 g (1.25 mmol) of N-Me-L-(4-Me-Phe)-L-(Tr-glutaminol). The reaction was cooled to 0° C. and O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) (0.476 g, 1.25 mmol) was added. The reaction mixture was allowed to warm to rt whereupon the DMF was removed in vacuo. The residue was dissolved with EtOAc, and the organic phase washed consecutively with 1N HCl, a sat NaHCO₃ solution, H₂ O, and brine. The solvent was dried over MgSO₄, filtered, and concentrated to give a residue which was subjected to column chromatography on silica gel (gradient; 2-5% MeOH/CHCl₃) to give 0.95 g (98%) of a white amorphous solid: IR(KBr) 3302, 2957, 2876, 1669, 1645, 1537, 1447, 1196, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.88 (s, 9H), 1.48-1.70 (m, 9H), 1.85 (m, 1H), 2.04 (m, 2H), 2.28 (s, 3H), 2.32 (m, 2H), 2.92 (m, 2H), 3.25 (dd, 1H, J=8.1, 3.5 Hz), 3.30 (dd, 1H, J=10.9, 3.7 Hz), 3.66 (m, 1H), 3.72 (m, 1H), 4.14 (m, 1H), 4.47 (m, 1H), 6.04 (d, 1H, J=7.7 Hz), 6.52 (d, 1H, J=7.7 Hz), 6.60 (d, 1H, J=7.0Hz), 7.05 (m, 5H), 7.24 (m, 15H). MS calcd for C₄₆ H₅₆ N₄ O₅ S+Na 799, found 799.

Preparation of Intermediate Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Glutaminal).

Using the general procedure described in Example 1 for the preparation of CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide), cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminal) was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminol) in quantitative yield and isolated as a white amorphous solid and used without further purification: IR(film) 3302, 3061, 3030, 2961, 2870, 1730, 1644, 1514, 1493, 1196, 911, 733, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.90 (s, 9H), 1.46-1.68 (m, 8H), 1.86 (m, 1H), 2.00-2.24 (m, 2H), 2.28 (s, 3H), 2.31 (m, 1H), 2.96 (m, 2H), 3.58 (m, 1H), 4.05 (m, 1H), 4.14 (m, 1H), 4.52 (m, 1H), 5.88 (m, 1H), 6.28 (m, 1H), 6.90 (m, 1H), 7.07 (m, 5H), 7.25 (m, 15H), 9.30 (s, 1H); MS calcd for C₄₆ H₅₄ N₄ O₅ S.CH₃ OH (methyl-hemiacetal)+Na 829, found 829.

Preparation of Intermediate Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-GIy)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-propenoate was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminal) (0.468 g, 0.627 mmol) to give 0.52 g of material contaminated with triphenylphosphine oxide after column chromatography on silica gel (gradient: 1-2.5% MeOH/CH₂ Cl₂), which was used without further purification: white amorphous solid: IR(film) 3302, 3061, 2967, 2868, 1721, 1642, 1514, 1491, 1370, 1192, 1036, 911, 731, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.72 (s, 9H), 1.29 (t, 3H, J=7.0 Hz), 1.46-1.68 (m, 6H), 1.86-2.05 (m, 4H), 2.29 (s, 3H), 2.32 (m, 2H), 2.91 (m, 2H), 3.00 (m, 1H), 3.62 (m, 1H), 4.07 (m, 1H), 4.17 (q, 2H, J=7.2 Hz), 4.43 (m, 2H), 5.61 (dd, 1H, J =15.8, 1.5 Hz), 5.95 (m, 1H), 6.34 (m, 1H), 6.57 (m, 1H), 6.64 (dd, 1H, J=15.8, 5.5 Hz), 7.03 (m, 5H), 7.24 (m, 15H). MS calcd for C₅₀ H₆₀ N₄ O₆ S+Na 867, found 867.

Preparation of Product--Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-propenoate was synthesized from ethyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-propenoate and isolated as a white solid after purification by column chromatography on silica gel using a gradient solvent system (1-5% MeOH/CH₂ Cl₂) (57% yield; two steps from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminal): IR (KBr) 3318, 2973, 2951, 2868, 1715, 1651, 1539, 1371, 1192 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.21 (t, 3H, J=7.2 Hz), 1.41-1.72 (m, 8H), 2.02 (m, 4H), 2.22 (s, 3H), 2.81 (m, 2H), 3.54 (m, 1H), 4.10 (q, 2H, J=7.0 Hz), 4.24 (d, 1H, J=9.3 Hz), 4.36 (m, 1H), 4.43 (m, 1H), 5.56 (dd, 1H, J=15.7, 1.4 Hz), 6.65 (dd, 1H, J=15.7, 5.5 Hz), 6.73 (s, 1H), 7.03 (m, 4H), 7.13 (s, 1H), 7.86 (d, 1H, J=9.3 Hz), 8.04 (d, 1H, J=8.4 Hz), 8.12 (d, 1H, J=7.8 Hz); HRMS calcd for C₃₁ H₄₆ N₄ O₆ S+Cs 735.2192, found 735.2180. Anal. (C₃₁ H₄₆ N₄ O₆ S) C, H, N, S.

Example 39--Preparation of Compound 175: Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-Propenoate. Preparation of Intermediate Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-2-methyl-3 - cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-propenoate was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminal) (0.466 g, 0.60 mmol) and (carbethoxyethylidene)triphenylphosphorane (0.24 g, 0.66 mmol) to give 0.487 g of material contaminated with triphenylphosphine oxide after column chromatography on silica gel (gradient: 1-2.5% MeOH/CH₂ Cl₂) which was used without further purification. white amorphous solid: IR(film) 3302, 3063, 2967, 2870, 1711, 1642, 1516, 1491, 1250, 1194, 911, 731, 698 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.88 (s, 9H), 1.31 (t, 3H, J=7.2 Hz), 1.50-1.77 (m, 6H), 1.81 (m, 2H), 1.82 (s, 3H), 2.06 (m, 2H), 2.28 (s, 3H), 2.31 (m, 2H), 2.93 (m, 2H), 3.64 (m, 1H), 4.04 (m, 1H), 4.20 (q, 2H, J=7.0 Hz), 4.40 (m, 1H), 4.58 (m, 1H), 5.90 (m, 1H), 6.30 (m, 3H), 7.01 (m, 5H), 7.24 (m, 15H). MS calcd for C₅₁ H₆₂ N₄ O₆ S+Na 881, found 881.

Preparation of Product--Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-2-methyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-Gln!-E-propenoate was synthesized from ethyl-2-methyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-Gln)!-E-propenoate and isolated as a white solid after purification by column chromatography on silica gel using a gradient solvent system (1-5% MeOH/CH₂ Cl₂) (55% yield; two steps from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminal): IR (KBr) 3324, 2963, 2870, 1707, 1647, 1550, 1516, 1257, 1196 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.22 (t, 3H, J=7.2 Hz), 1.41-1.73 (m, 8H), 1.77 (m, 3H), 2.00 (m, 4H), 2.20 (s, 3H), 2.78 (m, 2H), 3.55 (m, 1H), 4.12 (q, 2H, J=7.0 Hz), 4.23 (d, 1H, J=9.0 Hz), 4.35 (m, 1H), 4.48 (m, 1H), 6.29 (dd, 1H, J=9.3, 1.2 Hz), 6.72 (s, 1H), 6.99 (m, 4H), 7.13 (s, 1H), 7.86 (d, 1H, J=9.0 Hz), 8.03 (m, 2H); HRMS calcd for C₃₂ H₄₈ N₄ O₆ S+Cs 749.2349, found 749.2336. Anal. (C₃₂ H₄₈ N₄ O₆ S) C, H, N, S.

Example 40--Preparation of Compound 176: Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-Propenoate. Preparation of Intermediate Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-(Tr-Glutaminol).

This intermediate was prepared as a white solid in 75% yield from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly) and the free base of L-(4-F-Phe)-L-(Tr-glutaminol) HCl using the procedure described to prepare cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-Me-Phe)-L-(Tr-glutaminol). IR(KBr) 3299, 3063, 2969, 2870, 1651, 1510, 1447, 1225, 1192, 766, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.88 (s, 9H), 1.50-1.76 (m, 9H), 1.85 (m, 1H), 2.05 (m, 2H), 2.36 (m, 2H), 2.50 (m, 1H), 2.92 (m, 2H), 3.32 (m, 2H), 3.66 (m, 1H), 3.73 (m, 1H), 4.17 (m, 1H), 4.69 (m, 1H), 6.09 (d, 1H, J=7.0 Hz), 6.74 (m, 1H), 6.91 (m, 2H), 7.05 (m, 2H), 7.24 (m, 15H). MS calcd for C₄₆ H₅₃ N₄ O₅ SF+Na 803, found 803.

Preparation of Intermediate Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-(Tr-Glutaminal).

Using the general procedure described in Example 1 for the preparation CBZ-L-Leu-L-Phe-L-methioninal (sulfoxide), cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminal) was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminol) in quantitative yield and isolated as a white amorphous solid and used without further purification: IR(film) 3302, 3061, 3030, 2961, 2866, 1732, 1644, 1510, 1447, 1225, 1196, 911, 733, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.90 (s, 9H), 1.48-1.67 (m, 8H), 1.85 (m, 1H), 2.00-2.28 (m, 2H), 2.36 (m, 2H), 2.90 (dd, 1H, J=14.9, 6.1 Hz), 3.03 (dd, 1H, J=14.5, 6.8 Hz), 3.64 (m, 1H), 4.07 (m, 1H), 4.18 (m, 1H), 4.53 (m, 1H), 5.92 (m, 1H), 6.31 (m, 1H), 6.92 (m, 2H), 7.10 (m, 3H), 7.23 (m, 15H), 9.31 (s, 1H); MS calcd for C₄₅ H₅₃ N₄ O₅ SF.CH₃ OH (methyl-hemiacetal)+Na 833, found 833.

Preparation of Intermediate Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-3 - cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminal) (0.343 g, 0.44 mmol) to give 0.377 g of material contaminated with triphenylphosphine oxide after column chromatography on silica gel (gradient: 1-2.5% MeOH/CH₂ Cl₂) which was used without further purification: white amorphous solid: IR(KBr) 3314, 3285, 2969, 2936, 1723, 1651, 1510, 1447, 1370, 1190, 1038, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.88 (s, 9H), 1.28 (t, 3H, J=7.0 Hz), 1.48-1.78 (m, 8H), 1.83-2.15 (m, 4H), 2.32 (m, 2H), 2.85 (m, 1H), 3.00 (m, 1H), 3.61 (m, 1H), 4.16 (q, 2H, J=7.0 Hz), 4.39 (m, 2H), 5.54 (d, 1H, J=15.4 Hz), 6.17 (m, 1H), 6.63 (dd, 1H, J=15.4, 4.0 Hz), 6.91 (m, 2H), 7.01 (m, 2H), 7.28 (m, 15H), 7.45 (m, 1H), 7.54 (m, 1H), 7.63 (m, 1H). MS calcd for C₄₉ H₅₇ N₄ O₆ SF+Na871, found 871.

Preparation of Product--Ethyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-propenoate was synthesized from ethyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate and isolated as a white solid after purification by column chromatography on silica gel using a gradient solvent system (1-5% MeOH/CH₂ Cl₂) (56% yield; two steps from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminal): IR (KBr) 3310, 2961, 2868, 1713, 1649, 1512, 1192 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.21 (t, 3H, J=7.2 Hz), 1.40-1.69 (m, 8H), 2.01 (m, 4H), 2.80 (dd, 1H, J=14.0, 8.1 Hz), 2.90 (dd, 1H, J=13.2, 7.0 Hz), 3.54 (quin, 1H, J=7.2 Hz), 4.09 (q, 2H, J=6.9 Hz), 4.28 (d, 1H, J=9.6 Hz), 4.38 (m, 1H), 4.47 (m, 1H), 5.48 (dd, 1H, J=15.6, 1.3Hz), 6.64 (dd, 1H,J=15.6, 5.3Hz), 6.74 (bs, 1H), 7.00 (t, 2H,J=8.8 Hz), 7.13 (bs, 1H), 7.20 (d, 1H, J=8.5 Hz), 7.22 (d, 1H, J=8.5 Hz), 7.88 (d, 1H, J=9.2 Hz), 8.08 (d, 1H, J=8.1 Hz), 8.18 (d, 1H, J=7.7 Hz); HRMS calcd for C₃₀ H₄₃ N₄ O₆ SF+Cs 739.1942, found 739.1954. Anal. (C₃₀ H₄₃ N₄ O₆ SF) C, H, N, S.

Example 41--Preparation of Compound 177: Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-Propenoate. Preparation of Intermediate Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-Propenoate.

Using the procedure described in Example 1 for the preparation of ethyl-3- CBZ-L-Leu-L-Phe-L-Met (sulfoxide)!-E-propenoate, ethyl-2-methyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate was synthesized from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminal) (0.297 g, 0.38 mmol) and (carbethoxyethylidene)triphenylphosphorane (0.152 g, 0.42 mmol) to give 0.377 g of material contaminated with triphenylphosphine oxide after column chromatography on silica gel (gradient: 1-2.5% MeOH/CH₂ Cl₂) which was used without further purification. white amorphous solid: IR(film) 3356, 3291, 3063, 2973, 2951, 1711, 1651, 1510, 1447, 1256, 1190, 752, 700 cm⁻¹ ; ¹ H NMR (CDCl₃) δ 0.90 (s, 9H), 1.31 (t, 3H, J=7.0 Hz), 1.51-1.83 (m, 11H), 2.17 (m, 2H), 2.28 (m, 2H), 2.75-3.02 (m, 2H), 3.66 (m, 1H), 4.16 (m, 3H), 4.45 (m, 1H), 4.60 (m, 1H), 6.30 (m, 2H), 6.58 (m, 1H), 6.78 (m, 1H), 6.88 (m, 2H), 6.98 (m, 3H), 7.20 (m, 15H). MS calcd for C₅₀ H₅₉ N₄ O₆ SF+Na 885, found 885.

Preparation of Product--Ethyl-2-Methyl-3- Cyclopentylthiocarbonyl-L-α-(t-Butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-Propenoate.

Using the procedure described in Example 34 for the preparation of ethyl-3- ethylthiocarbonyl-L-α-(t-butyl-Gly)-L-Phe-L-Gln!-E-propenoate, ethyl-2-methyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-Gln!-E-propenoate was synthesized from ethyl-2-methyl-3- cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-Gln)!-E-propenoate and isolated as a white solid after purification by column chromatography on silica gel using a gradient solvent system (1-5% MeOH/CH₂ Cl₂) (55% yield; two steps from cyclopentylthiocarbonyl-L-α-(t-butyl-Gly)-L-(4-F-Phe)-L-(Tr-glutaminal): IR (KBr) 3326, 2951, 2868, 1713, 1645, 1553, 1510, 1260, 1194 cm⁻¹ ; ¹ H NMR (DMSO-d₆) δ 0.83 (s, 9H), 1.22 (t, 3H, J=7.0 Hz), 1.41-1.75 (m, 8H), 1.77 (m, 3H), 1.92 (m, 4H), 2.77 (dd, 1H, J=13.8, 8.3 Hz), 2.85 ((dd, 1H, J=13.6, 7.0 Hz), 3.55 (quin, 1H, J=7.0 Hz), 4.12 (q, 2H, J=7.1 Hz), 4.22 (d, 1H, J=9.2 Hz), 4.38 (m, 1H), 4.45 (m, 1H), 6.24 (dd, 1H, J=9.2, 1.5 Hz), 6.72 (bs, 1H), 6.96 (t, 2H, J=8.8 Hz), 7.87 (d, 1H, J=8.8 Hz), 8.03 (d, 1H, J=8.1 Hz), 8.11 (d, 1H, J=7.7 Hz); HRMS calcd for C₃₁ H₄₅ N₄ O₆ SF+Cs 753.2098, found 753.2084. Anal. (C₃₁ H₄₅ N₄ O₆ SF) C, H, N, S.

Example 42--Preparation of Compound 179: Ethyl-3-(Cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-Gln)-E-Propenoate. Preparation of Product Ethyl-3-(Cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-Gln)-E-Propenoate

Using the procedure described in Example 36 for the preparation of ethyl-3- cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-Gln!-E-propenoate, ethyl-3-(cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L-Gln)-E-propenoate was synthesized from ethyl-3-(cyclopentylthiocarbonyl-L- S(O)-Me-Pen!-L-Phe-L- Tr-Gln!)-E-propenoate in 40% yield (3 steps from cyclopentylthiocarbonyl-L-(S-Me-Pen)-L-Phe-L-(Tr-glutaminol)): white amorphous solid: IR (KBr) 3302, 1662, 1541, 1458, 1205, 1138, 1028 cm⁻¹ ; ¹ H NMR (DMSO-d₆) (mixture of diastereomers) δ 1.03 (s), 1.12 (s), 1.21 (t, 3H, J=6.0 Hz), 1.42-1.76 (m), 2.0-2.21 (m), 2.34 (s), 2.42 (s), 2.80-2.87 (m), 2.93-3.11 (m), 3.47-3.60 (m), 4.10 (q, J=6.0 Hz), 4.35-4.40 (m), 4.44-4.52 (m), 4.64 (d, J=6.0 Hz), 5.58-5.62 (m), 6.60-6.70 (m), 6.75 (bs), 7.14-7.21 (m), 8.16-8.22 (m), 8.41 (d, J=9.0 Hz), 8.54 (d, J=9.0 Hz). HRMS calcd for C₃₀ H₄₄ N₄ O₇ S₂ +Cs 769.1706, found 769.1727.

While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. Thus, it is intended that the present invention cover the modifications and variations, provided they come within the scope of the appended claims and their equivalents.

BIOCHEMICAL AND BIOLOGICAL EVALUATION Inhibition of Rhinovirus Protease

Stock solutions (50 mM, in DMSO) of various compounds were prepared; dilutions were in the same solvent. Recombinant Rhinovirus 3C proteases from serotypes 14, 16, 2 or 89 were prepared by the following standard chromatographic procedures: (1) ion exchange using Q Sepharose Fast Flow from Pharmacia; (2) affinity chromatography using Affi-Gel Blue from Biorad; and (3) sizing using Sephadex G-100 from Pharmacia. Assays contained 2% DMSO, 50 mM tris pH 7.6, 1 mM EDTA, a compound at the indicated concentrations, approximately 1 μM substrate, and 50-100 nM protease. For K_(i) determinations, the compound and the enzyme were preincubated for 10 minutes at 30° C. prior to addition of the substrate (substrate start). The k_(obs/I) values were obtained from reactions initiated by addition of enzyme rather than substrate. RVP activity is measured in the fluorescence resonance energy transfer assay. The substrate was (N-terminal) DABCYL-(Gly-Arg-Ala-Val-Phe-Gln-Gly-Pro-Val-Gyl)-EDANS. In the uncleaved peptide, the EDANS fluorescence was quenched by the proximal DABCYL moiety. When the peptide was cleaved, the quenching was relieved, and activity was measured as an increase in fluorescence signal. Data was analyzed using standard non linear fitting programs (Enzfit), and are shown Table 1.

                  TABLE 1     ______________________________________     COMPOUND #  RVP     INHIB       k.sub.obs/l (M-1sec-1)     ______________________________________     1                   77 (50)     ND     2                   6.6 μM (K.sub.i)                                     ND     3                   81 (0.1)    37,000                 (16)                6,500                 (89)                3,400                 (2)                 1,900     4                   49 (0.5)    790     5                   7.1 μM (K.sub.i)                                     221     6                   32 μM (K.sub.i)                                     350     7                   9.5 μM (K.sub.i)                                     2,400                 (16)    42 (1)      ND     8                   36 μM (K.sub.i)                                     61     9                   20 (1)      160     10                  55 (5)      270     11                  28 μM (K.sub.i)                                     20,000     12                  4.3 μM (K.sub.i)                                     2,200     13                  6.5 μM (K.sub.i)                                     54,000                 (16)                9,000                 (2)                 2,400                 (89)                5,500     14                  NI          ND     15                  55 (50)     27     16                  40(0.25)    3,500     17                  1.25 μM (K.sub.i)                                     6,100     18                  15.3 μM (K.sub.i)                                     7,700     19                  35 μM (K.sub.i)                                     7,900     20                  NI          ND     21                  9.9 μM (K.sub.i)                                     2,100     22                  4.3 μM (K.sub.i)                                     1,300     23                  177 μM (K.sub.i)                                     120     24                  ND          500,000     25                  5.5 μM (K.sub.i)                                     3,700     26                  52 (0.1)    5,400     27                  20 μM (K.sub.i)                                     3,000     28                  57 μM (K.sub.i)                                     4,000     29                  ND          ND     30                  373 μM (K.sub.i)                                     430     31                  25 (10)     21     32                  ND          280     33                  24 (10)     33     34                  25 (10)     34     35                  16.5 μM (K.sub.i)                                     46,388                 (2)     ND          2,357                 (16)    ND          9,177     36                  15 μM (K.sub.i)                                     12,000     37                  18.8 μM (K.sub.i)                                     5,900     38                  >50 μM (K.sub.i)                                     400     39                  ND          1,200     40                  ND          250     41                  ND          8,464     42                  ND          150,000     43                  ND          4,500     44                  12.6 μM (K.sub.i)                                     21,000     45                  NI          ND     46                  ND          120,000     49                  ND          460,000     51                  ND          310,000     52                  ND          15,000     53                  ND          11,320     56                  15 μM (K.sub.i)                                     5,624     59                  2.0 μM (K.sub.i)                                     200     60                  5.0 μM (K.sub.i)                                     575     61                  ND          125,940                 (2)     ND          14,000                 (16)    ND          25,000     62                  ND          600,000                 (2)     ND          600,000                 (16)    ND          300,000     65                  2.9 μM (K.sub.i)                                     ND     66                  ND          400,000     67                  ND          9,600     68                  15 μM (K.sub.i)                                     750     70                  ND          39,000     71                  ND          20,650     73                  ND          20,000                 (2)     ND          1,750                 (16)    ND          4,500     74                  2.4 μM (K.sub.i)     75                  ND     76                  30 μM (K.sub.i)                                     ND     77                  4.8 ND     78                  7.0 μM (K.sub.i)     79                  ND          13,900     80                  ND          200,000     81                  ND          124,000     82                  26 μM (K.sub.i)                                     7,300     83                  8.0 μM (K.sub.i)                                     ND     84                  ND          18,650     85                  3.0 μM (K.sub.i)                                     6,500     86                  4.0 μM (K.sub.i)                                     12,000     87                  6.0 μM (K.sub.i)                                     5,430     88                  >30 μM (K.sub.i)                                     8,960     89                  5 μM (K.sub.i)                                     53,360                 (16)    ND          2,800     90                  ND          10,918                 (16)    ND          3,600     91                  10 μM (K.sub.i)                                     5,427     92                  ND          445     93                  30 μM (K.sub.i)                                     3,444     94                  1.5 μM (K.sub.i)                                     5,800     95                  ND          >1000     96                  ND          300     97                  ND          12,900     98                  ND          91     99                  10 (50)     ND     100                 ND          1,200     101                 ND          11,288     102                 12 μM (K.sub.i)                                     3,845     103                 ND          29,200                 (2)     ND          1,106                 (16)    ND          3,354     104                 2.5 μM (K.sub.i)                                     8,000                 (16)    1.5 μM (K.sub.i)                                     ND     105                 ND          1,200     106                 2.0 μM (K.sub.i)                                     280,000                 (2)     ND          28,400                 (16)    ND          75,0900     107                 13.5 μM (K.sub.i)                                     3,655     108                 ND          4,694     109                 ND          1,348     110                 ND          9,072     111                 5.0 μM (K.sub.i)                                     2,065     112                 13 μM (K.sub.i)                                     6,800     113                 ND          8,877     114                 ≧1.0 μM (K.sub.i)                                     82,320                 (2)     ND          1,971     115                 11 μM (K.sub.i)                                     4,485     116                 ND          23,670     117                 ND          18,760     118                 39 μM (K.sub.i)                                     1,448     119                 5.0 μM (K.sub.i)                                     69,800     120                 6.0 μM (K.sub.i)                                     91,300                 (2)     ND          8,900                 (16)    ND          20,034     121                 12 μM (K.sub.i)                                     238     122                 ND          1,252     123                 ND          890     124                 ND          1,000     125                 ND          >500,000     126                 ND          29,000     127                 ND          28,347     128                 ND          22,691     129                 ND          230,000     130                 30-40 nM (K.sub.i)                                     ND     131                 NI          NI     132                 10 μM (K.sub.i)                                     10,800     133                 ND          9,600     134                 ND          1,769     135                 ND          16,270                 (2)     ND          671                 (16)    ND          3,465     136                 ND          4,210     137                 ND          2,344                 (2)     ND          643                 (16)    ND          1,157     138                 20 μM (K.sub.i)                                     1,769     139                 ND          43,140                 (2)     ND          691                 (16)    ND          1,259     140                 ND          7,122     141                 ND          2,309     142                 ND          2,929     143                 ND          2,963     144                 ND          ND     145                 10-20 μM (K.sub.i)                                     ND     146                 ND          62,500                 (2)     ND          7,790                 (16)    ND          16,900     147                 ND          18,600                 (2)     ND          1,000                 (16)    ND          4,290     148                 1.0 μM (K.sub.i)                                     57,000                 (2)     ND          8,300                 (16)    ND          14,800     149                 ND          39,940                 (2)     ND          2,840                 (16)    ND          7,700     150                 ND          573     151                 >4.8 μM (K.sub.i)                                     39,750     152                 3.2 μM (K.sub.i)                                     38,900     153                 1.4 μM (K.sub.i)                                     141,200                 (2)     ND          13,350                 (16)    ND          30,650     154                 1.1 μM (K.sub.i)                                     78,900                 (2)     ND          5,400                 (16)    ND          13,900     155                 4.2 mM (K.sub.i)                                     59,425                 (2)     ND          1,390                 (16)    ND          5,250     156                 ND          NI     157                 6.0 μM (K.sub.i)                                     161,500                 (2)     ND          9,700                 (16)    ND          30,800     158                 17 μM (K.sub.i)                                     22,600                 (2)     ND          2,200                 (16)    ND          6,400     159                 0.5 μM (K.sub.i)                                     35,000                 (2)     ND          2,500                 (16)    ND          6,500     160                 ND          312,000                 (2)     ND          26,710                 (16)    ND          50,000     161                 ND          1,086,000                 (2)     ND          200,000                 (16)    ND          126,000     162                 ND          800,000                 (2)     ND          150,000                 (16)    ND          80,000     163                 3.6 μM (K.sub.i)                                     9,800     164                 ND          155,500     165                 ND          97,000                 (2)     ND          5,600                 (16)    ND          20,200     166                 ND          40,900                 (2)     ND          3,500                 (16)    ND          7,700     167                 ND          165,400                 (2)     ND          10,700                 (16)    ND          42,100     168                 ND          37,800     169                 ND          800     170                 ND          85,300                 (2)     ND          8,400                 (16)    ND          30,000     171                 ND          21,200                 (2)     ND          830                 (16)    ND          3,250     172                 ND          31,700                 (2)     ND          2,000                 (16)    ND          6,000     173                 ND          1,000,000                 (2)     ND          113,000                 (16)    ND          185,000     174                 ND          800,000     175                 ND          124,000     176                 0.48 μM (K.sub.i)                                     240,000     177                 ND          80,300     178                 ND          286,300     179                 0.36 μM (K.sub.i)                                     300,000     180                 0.42 μM (K.sub.i)                                     300,000     181                 ND          1,000,000     182                 ND          114,360     183                 0.55 μM (K.sub.i)                                     500,000                 (16)    ND          60,000     184                 ND          59,900     185                 ND          600,000     186                 ND          950,000     187                 NI          ND     188                 0.16 μM (K.sub.i)                                     580,000     189                 ND          386,000     190                 ND          29,230     ______________________________________

In the above table, all data is for RVP serotype-14 unless otherwise noted in parentheses. All strains of human rhinovirus (HRV) were purchased from American Type Culture Collection (ATCC), except for serotype 14, which was produced from the infectious cDNA clone constructed and supplied to us by Dr. Roland Rueckert at the Institute for Molecular Virology, University of Wisconsin, Madison, Wis. The column designated INHIB represents the percent inhibition, with the concentration of the compound in μM indicated in parentheses, unless K_(i) was assigned as designated by (K_(i)), at 10 minute preincubation with 50 nM RVP prior to addition of substrate was used. The data in the column designated k_(obs/I) was measured from progress curves in enzyme start experiments. The designation NI indicates that no inhibition was obtained when 10 μM of a compound was used. The designation ND indicates that a value was not determined for that compound.

Antirhinoviral HI-HeLa Cell Culture Assay

In the Cell Protection Assay, the ability of compounds to protect cells against HRV infection was measured by the XTT dye reduction method. This method is described in Weislow, O. S., R. Kiser, D. L. Fine, J. Bader, R. H. Shoemaker, and M. R. Boyd, J. Natl. Cancer Inst. 1989, 81, 577-586, which is incorporated herein by reference.

HI-HeLa cells were infected with HRV-14 at a multiplicity of infection (m.o.i.) of 0.13 (virus particles/cell) or mock-infected with medium only. Infected or mock-infected cells were resuspended at 8×10⁵ cells per mL and incubated with appropriate concentrations of compounds of formulas I and II. Two days later, XTT/PMS was added to test plates and the amount of formazan produced was quantified spectrophotometrically at 450/650 nm. The EC₅₀ was calculated as the concentration of compound that increased the percentage of formazan production in compound-treated, virus-infected cells to 50% of that produced by compound-free mock-infected cells. The 50% cytotoxic dose (CC₅₀) was calculated as the concentration of compound that decreased the percentage of formazan produced in compound-treated, mock-infected cells to 50% of that produced in compound-free, mock-infected cells. The therapeutic index (TI) was calculated by dividing the CC₅₀ the EC₅₀.

All strains of human rhinovirus (HRV) for use in this assay were purchased from American Type Culture Collection (ATCC), except for HRV serotype-14, which was produced from the infectious cDNA clone, constructed and supplied to us by Dr. Roland Rueckert the Institute for Molecular Virology, University of Wisconsin, Madison, Wis. HRV stocks were propagated, and antiviral assays were performed in HI-HeLa cells (ATCC). Cells were grown in Minimal Essential Medium, available from Life Technologies, with 10% fetal bovine serum.

The compounds were tested against control compounds WIN 51711, WIN 52084, and WIN 54954, all obtained from Sterling-Winthrop Pharmaceuticals, and control compound Pirodavir, obtained from Janssen Pharmaceuticals.

                  TABLE 2     ______________________________________     Compound #               EC.sub.50 (μM)                            CC.sub.50 (μM)                                      TI     ______________________________________     1         ND           ND     2         100          >320      >3.20     3         0.61         >320      >525     4         2.2          >320      >525     5         1.6          251       157     6         >320         >320     7         3.2          >320      >100     8         >320         >320      >5     9         >320         >320     10        200          >320      >2     11        1.3          >320      >246     12        1.6          >100      >63     13        2.0          58.9      29     14        17.8         500       28     15        >100         >100     16        32           >100      >3     17        1.8          >100      >56     18        0.64         >100      >156     19        1.35         >100      >74     20        >320         >320     21        22.4         >100      >5     22        56.2         251       >5     23        >100         >100     24        4.0          16        4     25        3.1          >100      >33     26        2.0          44.7      22     27        3.5          160       46     28        4.5          63.1      14     29        27           500       19     30        5.6          100       18     31        50.1         >100      >2     32        10           >100      >10     33        79.4         >100      >1     34        100          >100      >1     35        1.8          >320      >178     36        5.6          >320      >57     37        4.0          >100      >25     38        >320         >320     39        >320         >320     40        >100         >100     41        56           56        1     42        22.4         100       >4     43        10           18        >1     44        1.0          >320      >320     45        >100         >100     46        3.2          45        14     49        2.4          19.1      8     51        32           32     52        1.7          5.6       3     53        5.3          >320      >60     56        1.6          >320      >203     59        >320         >320     60        158          >320      >2     61        0.89         56        63     62        1.6          >100      >63     65        158          >320      >2     66        1.4          6.3       5     67        5.2          >320      >62     68        16           >320      >20     70        1.2          >320      >267     71        14.1         >320      23     73        ND     74        10           250       25     75        5.0          >100      >20     76        >320         >320     77        >320         >320     78        10           79.4      8     79        45           >320      >7     80        50           >320      >6     81        8.0          112       14     82        3.0          >320      >107     83        100          >320      >3     84        16           >320      >20     85        16           >320      >20     86        17           >320      >19     87        10.6         >320      >30     88        8.8          >160      >18     89        1.8          29        16     90        5.2          >320      >61     91        56           >320      >6     92        5.6          56        10     93        >320         >320     94        46.8         >320      >7     95        >320         >320     96        19.1         100       5     97        >320         >320     98        100          >320      >3.2     99        141          >320      >2     100       11.1         >320      >29     101       2.0          >320      >160     102       5.6          >320      >57     103       1.7          >320      >188     104       5.2          >320      >61     105       14           >320      >23     106       0.27         >320      >1185     107       13.5         >320      >23     108       6.0          >320      >53     109       20           >320      >16     110       1.3          >320      >246     111       29.5         >320      >11     112       27           >320      >12     113       10           >320      >32     114       0.55         >320      >582     115       19           >320      >17     116       0.6          >320      >533     117       1.0          >320      >320     118       17.8         >320      >18     119       1.1          >320      >291     120       0.46         >320      >695     121       >320         >320     122       1.78         10        5     123       >320         >320     124       126          >320      >2     125       >100         100     126       >320         >320     127       >100         ND     128       >320         >320     129       >320         >320     130       15.8         >100      >6     131       >100         >100     132       5.6          >320      >57     133       >177         177     134       56.2         >320      >5     135       1.9          >320      >168     136       >320         >320     137       223.9        >320      >1     138       >41.7        41.7     139       3.5          >320      >91     140       39           >320      >8     141       5.4          >320      >59     142       8.9          >320      >36     143       10           >320      >32     144       103.5        >320      >3     145       >320         >320     146       0.38         >320      >842     147       205          >320      >1     148       0.25         >320      >1280     149       1.78         >320      >180     150       >320         >320     151       0.32         177.8     555     152       1.78         >320      >180     153       0.12         >320      >2667     154       5.5          >320      >58     155       0.18         >320      >1778     156       35.5         >320      >9     157       0.56         >320      >571     158       5.9          >320      >54     159       2.4          >320      >133     160       5.0          >320      >64     161       0.17         >100      >588     162       0.32         >100      >312     163       0.5          >100      >200     164       0.71         >100      >141     165       0.20         >100      >500     166       5.6          >100      >18     167       0.083        >100      >1204     168       0.32         >100      >312     169       18           >100      >5     170       0.20         >100      >500     171       0.71         >100      >140     172       0.79         >100      >126     173       0.80         >100      >1250     174       0.056        >100      >1786     175       0.18         >100      >555     176       0.14         >100      >714     177       0.5          >100      >200     178       0.10         >100      >1000     179       1.78         >100      >56     180       0.056        >100      >1785     181       0.1          >100      >1000     182       0.18         >100      >556     183       0.03         >100      >3333     184       0.19         >100      >526     185       0.50         >100      >200     186       ND           ND     187       ND           ND     188       ND           ND     WIN 51711 0.78         >60       >77     WIN 52084 0.07         >10       >143     WIN 54954 2.13         >63       >30     Pirodavir 0.03         >10       >300     ______________________________________

Normal Human Bronchial Epithelial Cell Assay

Normal human bronchial cells were obtained from cadavers and cultured. The cells were plated 2×10⁴ per well in a 96 well plate. They were allowed to adhere and grow for 24 hours in 200 μL of serum-free bronchial/tracheal epithelial cell growth medium at 37° C. with 5% CO₂. Human Rhinovirus-serotype 10 (HRV-10) was purchased from American Type Culture Collection (ATCC). To start the assay, the supernatant was removed, and HRV-10 at an m.o.i. of 10 (virus particles/cell) was added to each well along with the appropiate amount of compound of formula I or II. The plate was then incubated at 34° C. After 3 hours the supernatant was removed, and 200 μL of media was added along with the same concentration of compound as used in the beginning of the assay. The plates were incubated for 3-4 days at 34° C. To determine the amount of cell growth, an MTT assay (0.5 mgs/mL), as described in Mosmann, T. J. J. Immunol. Methods 1983, 65, 55-63, which is incorporated herein by reference, was performed on the cells, and the plate was read at an optical density of 540 nm. The results of the assay are set forth in Table 3. The compounds were tested against control compound Pirodavir, obtained from Janssen Pharmaceuticals. The EC₅₀ was measured as described above for the HI-HeLa Cell Culture Assay.

                  TABLE 3     ______________________________________            Compound #                    ED.sub.50 (μM)     ______________________________________            3       0.04            4       0.15            5       0.001            11      0.0007            12      0.004            13      0.0004            27      0.07            85      0.005            pirodavir                    0.0075     ______________________________________

Anticoxsackieviral HI-HeLa Cell Culture Assay

The ability of compounds to protect calls against CVB-3 infection was measured by the XTT dye reduction method, which is described in Weislow, O. S., R. Kiser, D. L. Fine, J. Bader, R. H. Shoemaker, and M. R. Boyd, 1989, J. Natl. Cancer Inst. 81:577-586, which is incorporated herein by reference. Specifically, HI-HeLa cells were infected with CVB-3 at a multiplicity of infection (m.o.i.) of 0.08 or mock-infected with medium only. Infected or mock-infected cells were resuspended at 8×10⁵⁰ cells per mL and incubated with appropriate concentrations of compound. One day later, XTT/PMS was added to test plates and the amount of formazan produced was quantified spectrophotometrically at 450/650 nm. The EC₅₀ was calculated as the concentration of compound that increased the percentage of formazan production in compound-treated, virus-infected cells to 50% of that produced by compound free, mock-infected cells. The 50% cytotoxic dose (CC₅₀) was calculated as the concentration of drug that decreased the percentage of formazan produced in compound treated, mock-infected cells to 50% of that produced in compound-free, mock-infected cells. The therapeutic index (TI) was calculated by dividing the CC₅₀ by the EC₅₀.

The Coxsackie strain B-3 (CVB-3) was purchased from American Type Culture Collection (ATCC). Virus stocks were propagated and antiviral assays were performed in Hi-HeLa cells (ATCC). Cells were grown in Minimal Essential Medium with 10% fetal bovine serum.

The compounds were tested against control compound WIN 54954, obtained from Sterling Winthrop Pharmaceuticals, and control compound Pirodavir, obtained from Janssen Pharmaceuticals.

                  TABLE 4     ______________________________________     Compound # EC.sub.50 (μM)                             CC.sub.50 (μM)                                      TI     ______________________________________     3          39.8         >320     >8     11         8.9          >320     >35     13         >100         >100     21         158          >320     >2     23         >100         >100     24         10           10       1     27         20           102.7    >5     37         17.8         >100     >5.6     41         >100         >100     WIN 54954  >100         >100     Pirodavir  >100         >100     ______________________________________ 

We claim:
 1. A compound of the formula (I): ##STR204## wherein: R₁ is H, F, an alkyl group, OH, SH, an O-alkyl group, or an S-alkyl group; one of R₂ and R₅ is H or an alkyl group and the other is ##STR205## wherein R₃₅ is H, an alkyl group, or an aryl group, and R₃₆ is H or an alkyl group;R₃ and R₆ are independently H, F, or an alkyl group; R₄ is H, OH, or a suitable organic moiety; Z and Z₁ are independently H, F, an alkyl group, a cycloalkyl group, an aryl group, --C(O)R₂₁, --CO₂ R₂₁, --C(O)NR₂₁ R₂₂, --C(O)NR₂₁ OR₂₂, --C(S)R₂₁, --C(S)NR₂₁ R₂₂, --NO₂, --SOR₂₁, --SO₂ R₂₁, --SO₂ NR₂₁ R₂₂, --SO(NR₂₁)(OR₂₂), --SONR₂₁, --SO₃ R₂₁, --PO(OR₂₁)₂, --PO(R₂₁)R₂₂), --PO(NR₂₁ R₂₂)(OR₂₃), --PO(NR₂₁ R₂₂)(NR₂₃ R₂₄), --C(O)NR₂₁ NR₂₂ R₂₃, or --C(S)NR₂₁ NR₂₂ R₂₃, wherein R₂₁, R₂₂, R₂₃, and R₂₄ are independently H, an alkyl group, a cycloalkyl group, an aryl group, an acyl group, or a thioacyl group, with the proviso that at least one of Z or Z₁ is a --CO₂ R₅₀ group, where R₅₀ represents an alkyl group, a cycloalkyl group, or an aryl group; or Z and Z₁ both as defined above, together with the atoms to which they are bonded, form a cyclic carboxylic acid ester group; or a pharmaceutically acceptable prodrug, salt, or solvate thereof; and wherein the compound, pharmaceutically acceptable prodrug, salt, or solvate thereof, has antipicornaviral activity with an EC₅₀ less than or equal to 100 μM in the HI-HeLa cell culture assay.
 2. A compound of claim 1 wherein R₁ is H or F, or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 3. A compound of claim 1 wherein R₄ is an acyl group or a sulfonyl group, or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 4. A compound according to claim 1, wherein said compound has the formula ##STR206## wherein: R₄ is PhCH₂ OC(O), X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; orR₄ is CH₃ CH₂ CH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; or R₄ is PhCH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; or R₄ is CH₃ CH₂ SO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; or R₄ is PhSO₂, X₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 5. A compound according to claim 1, wherein said compound has the formula IX: ##STR207## wherein R₆ is H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Z is H, andZ₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR208## Z₁ is CO₂ CH₂ Ch₃, R₃ is CH₂ Ph, and R₄ is ##STR209## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR210## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR211## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₁ is ##STR212## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR213## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR214## Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR215## Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR216## and R₄ is ##STR217## or a pharmaceutically acceptable prodrug, salt or solvate thereof.
 6. A pharmaceutical composition comprising:(a) a therapeutically effective amount of a compound as defined in claim 1 or a pharmaceutically acceptable prodrug, salt, or solvate thereof; and (b) a pharmaceutically acceptable carrier, diluent, vehicle, or excipient.
 7. A method of treating a mammalian disease condition mediated by picornaviral protease activity that comprises administering to a mammal for the purpose of said treating a therapeutically effective amount of a compound as defined in claim 1 or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 8. A method of inhibiting the activity of a picornaviral 3C protease that comprises contacting the picornaviral 3C protease for the purpose of said inhibiting with an effective amount of a compound as defined in claim 1 or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 9. A method of inhibiting the activity of a rhinoviral protease that comprises contacting the rhinoviral protease for the purpose of said inhibiting with an effective amount of a compound as defined in claim 1 or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 10. A method of making a compound according to claim 1, comprising converting a compound of formula Q ##STR218## wherein R₁, R₂ and R₅ are as defined in claim 1, and P₁ is a protective group, or a salt or solvate thereof, to a compound of formula I, as defined in claim 1, or a pharmaceutically acceptable prodrug, salt or solvate thereof.
 11. A method according to claim 10 wherein P₁ is benzyloxy carbonyl or t-butoxycarbonyl.
 12. A method a making a compound according to claim 1, comprising converting a compound of the formula B: ##STR219## wherein R₁, R₂ and R₅ are as defined in claim 1, or a salt or solvate thereof, to a compound of formula I, as defined in claim 1, or a pharmaceutically acceptable prodrug, salt or solvate thereof.
 13. A method of making a compound according to claim 1, comprising converting a compound of formula O, ##STR220## wherein R₁, R₂, R₅, Z and Z₁ are as defined in claim 1 and P₁ is a protective group, or a salt or solvate thereof, to a compound of formula I, as defined in claim 1, or a pharmaceutically acceptable prodrug, salt or solvate thereof.
 14. A method according to claim 13, werein P₁ is benzyloxy carbonyl or t-butoxycarbonyl.
 15. A method of preparing a compound according to claim 1, (comprising converting a compound of formula P: ##STR221## wherein R₁, R₂, R₅, Z and Z₁ are as defined in claim 1, or a salt or solvate thereof, to a compound of formula I, as defined in claim 1, or a pharmaceutically acceptable prodrug, salt solvate thereof.
 16. A compound according to claim 1, or a pharmaceutically acceptable prodrug or a pharmaceutically acceptable salt, solvate, or any crystal form thereof, wherein said antipicornaviral activity is antirhinoviral activity.
 17. A compound according to claim 1, or a pharmaceutically acceptable prodrug or a pharmaceutically acceptable salt, solvate, or any crystal form thereof, wherein said antipicornaviral activity is anticoxsackieviral activity.
 18. A compound according to claim 1, wherein the compound has the formula II: ##STR222## wherein: R₃₁ is H, F, or an alkyl group;R₃₂ is ##STR223## wherein: R₃₅ is H, an alkyl group, or an aryl group, and R₃₆ is H or an alkyl group; R₃₃ is H or an alkyl group; R₃₄ is an alkyl group, a cycloalkyl group, an aryl group, an O-alkyl group, an O-cycloalkyl group, an O-aryl group, an S-alkyl group, an NH-alkyl group, an NH-aryl group, an N,N-dialkyl group, or an N,N-diaryl group; or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 19. A compound according to claim 1, wherein Z and Z₁ are independently H, an aryl group, --C(O)R₂₁, --CO₂ R₂₁, --C(O)NR₂₁ R₂₂, --C(O)NR₂₁ OR₂₂, --C(S)R₂₁, --C(S)NR₂₁ R₂₂, --NO₂, --SOR₂₁, --SO₂ R₂₁, --SO₂ NR₂₁ R₂₂, --SO(NR₂₁)(OR₂₂), --SONR₂₁, --SO₃ R₂₁, --C(O)NR₂₁ NR₂₂ R₂₃, or --C(S)NR₂₁ NR₂₂ R₂₃ ;wherein R₂₁, R₂₂, and R₂₃ are independently H, an alkyl group, a cycloalkyl group, an aryl group, or an acyl group, with the proviso that at least one of Z or Z₁ is a --CO₂ R₅₀ group, where R₅₀ is an alkyl group, a cycloalkyl group, or an aryl group; or Z and Z₁ together with the atoms to which they are bonded, form a cyclic carboxylic acid ester group; or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 20. A compound according to claim 18, wherein R₃₂ is --CH₂ CH₂ C(O)NH₂ or --CH₂ CH₂ C(O)NHCPh₃ ;or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 21. A compound according to claim 1, wherein the compound has the formula III: ##STR224## wherein: R₂ is CH₂ CH₂ C(O)NHCPh₃, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃,R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₂ CH₃, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is CO₂ CH₃, and Z₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH₃, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is CO₂ CH(CH₃)₂, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR225## R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR226## or R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is ##STR227## or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 22. A compound according to claim 1, wherein the compound has the formula VII: ##STR228## or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 23. A compound according to claim 1, wherein the compound has the formula VIII: ##STR229## wherein: X₁ is F, R₂ is CH₂ CH₂ C(O)NH₂, Y is CH, Z is H, and Z₁ is CO₂ CH₂ CH₃ ; or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 24. A compound according to claim 1, wherein the compound has the formula III: ##STR230## wherein R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is CH₃, and Z₁ is CO₂ CH₂ CH₃, orR₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, and Z and Z₁ together form ##STR231## or R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, Z is H, and Z₁ is --CHO or --CH═NOCH₃ ; or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 25. A compound according to claim 1, wherein the compound has the formula XIV: ##STR232## wherein R₆ is H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, Z is H, Z₁ is CO₂ CH₂ CH₃, andR₃ is CH₂ Ph and R₄ is ##STR233## R₃ is ##STR234## and R₄ is ##STR235## R₃ is CH₂ Ph and R₄ is ##STR236## R₃ is CH₂ Ph and R₄ is ##STR237## R₃ is ##STR238## and R₄ is ##STR239## R₃ is CH₂ Ph and R₄ is ##STR240## R₃ is ##STR241## and R₄ is ##STR242## R₃ is CH₂ Ph and R₄ is ##STR243## R₃ is CH₂ Ph and R₄ is ##STR244## R₃ is CH₂ CH₃ and R₄ is ##STR245## R₃ is CH₃ and R₄ is ##STR246## R₃ is CH₂ Ph and R₄ is ##STR247## R₃ is ##STR248## and R₄ is ##STR249## R₃ is CH₂ Ph and R₄ is ##STR250## R₃ is CH₂ Ph and R₄ is ##STR251## R₃ is CH₂ Ph and R₄ is ##STR252## R₃ is CH₂ Ph and R₄ is ##STR253## or R₃ is CH₂ Ph and R₄ is ##STR254## or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 26. A compound according to claim 1, wherein the compound has the formula XIV: ##STR255## wherein R₆ is H, R₁ is H, R₃ is CH₂ Ph, R₂ is CH₂ CH₂ C(O)NH₂, Z and Z₁ together form ##STR256## and R₄ is ##STR257## or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 27. A compound according to claim 1, wherein the compound has the formula XIV: ##STR258## wherein R₆ H, R₁ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₄ is ##STR259## R₃ is CH(OH)CH₃, Z is H and Z₁ is CO₂ CH₂ CH₃,R₃ is ##STR260## Z is H and Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR261## Z is H and Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR262## Z is H and Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ CH(CH₃)₂, Z is H and Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ SCH₃, Z is H and Z₁ is CO₂ CH₂ CH₃, or R₃ is CH₂ SCH₂ CH₃, Z is H and Z₁ is CO₂ CH₂ CH₃ ; or a phanraceutically acceptable prodrug, salt, or solvate thereof.
 28. A compound according to claim 1, wherein the compound has the formula IX: ##STR263## wherein R₆ is H, R₃ is CH₂ Ph, R₂ is CH₂ CH₂ C(O)NH₂, andR₁ is OH, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR264## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR265## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR266## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR267## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR268## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR269## R₁ is H, Z is H, Z₁ is CO₂ CH₂ C(CH₃)₃, and R₄ ##STR270## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR271## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR272## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR273## R₁ is H, Z is CH₃, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR274## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR275## R₁ is H, Z is CH₃, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR276## R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR277## or R₁ is H, Z is H, Z₁ is CO₂ CH₂ CH₃, and R₄ is ##STR278## or a pharmaceutically acceptable prodrug, salt, or solvate thereof.
 29. A compound according to claim 1, wherein the compound has the formula IX: ##STR279## wherein R₆ is H, R₂ is CH₂ CH₂ C(O)NH₂, R₁ is H, andZ is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR280## and R₄ is ##STR281## Z is Ch₃ Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR282## and R₄ is ##STR283## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR284## and R₄ is ##STR285## Z is CH₃, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR286## and R₄ is ##STR287## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR288## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR289## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR290## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is CH₂ Ph, and R₄ is ##STR291## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR292## and R₄ is ##STR293## Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR294## and R₄ is ##STR295## or Z is H, Z₁ is CO₂ CH₂ CH₃, R₃ is ##STR296## and R₄ is ##STR297## or a pharmaceutically acceptable prodrug, salt, or solvate thereof. 